diff --git a/Cargo.lock b/Cargo.lock
index 1e28db99d..588fc27b8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -292,7 +292,7 @@ dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethjson 0.1.0",
  "ethkey 0.3.0",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-machine 0.1.0",
@@ -583,7 +583,7 @@ name = "elastic-array"
 version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
 ]
 
 [[package]]
@@ -707,7 +707,7 @@ dependencies = [
  "fake-hardware-wallet 0.0.1",
  "hardware-wallet 1.12.0",
  "hashdb 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "journaldb 0.2.0",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -761,7 +761,7 @@ dependencies = [
  "ethcore-db 0.1.0",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.3.0",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -790,7 +790,7 @@ version = "0.1.0"
 dependencies = [
  "common-types 0.1.0",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -831,7 +831,7 @@ dependencies = [
  "fastmap 0.1.0",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashdb 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hasher 0.1.1",
@@ -884,7 +884,7 @@ dependencies = [
  "ethkey 0.3.0",
  "fetch 0.1.0",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "hyper 0.12.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -969,7 +969,7 @@ dependencies = [
  "ethkey 0.3.0",
  "fetch 0.1.0",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1079,7 +1079,7 @@ dependencies = [
  "ethstore 0.2.1",
  "fastmap 0.1.0",
  "hashdb 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hasher 0.1.1",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1212,7 +1212,7 @@ dependencies = [
  "bit-set 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "criterion 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1332,7 +1332,7 @@ name = "fixed-hash"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1359,6 +1359,11 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fs_extra"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -1489,8 +1494,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "heapsize"
 version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/cheme/heapsize.git?branch=ec-macfix#421df390a930cb523a09e5528e6fe57b534b3b26"
 dependencies = [
+ "jemallocator 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1705,6 +1711,25 @@ name = "itoa"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "jemalloc-sys"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "jemallocator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "jemalloc-sys 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "jni"
 version = "0.10.2"
@@ -1731,7 +1756,7 @@ dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fastmap 0.1.0",
  "hashdb 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hasher 0.1.1",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2058,7 +2083,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "memory-cache"
 version = "0.1.0"
 dependencies = [
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "lru-cache 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2073,7 +2098,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "hashdb 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "plain_hasher 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -4011,7 +4036,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)",
  "rustc-hex 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4431,6 +4456,7 @@ dependencies = [
 "checksum fixedbitset 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "86d4de0081402f5e88cdac65c8dcdcc73118c1a7a465e2a05f0da05843a8ea33"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum fs-swap 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "921d332c89b3b61a826de38c61ee5b6e02c56806cade1b0e5d81bd71f57a71bb"
+"checksum fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)" = "49e7653e374fe0d0c12de4250f0bdb60680b8c80eed558c5c7538eec9c89e21b"
@@ -4444,7 +4470,7 @@ dependencies = [
 "checksum hamming 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "65043da274378d68241eb9a8f8f8aa54e349136f7b8e12f63e3ef44043cc30e1"
 "checksum handlebars 0.32.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d89ec99d1594f285d4590fc32bac5f75cdab383f1123d504d27862c644a807dd"
 "checksum hashdb 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d91261ee336dd046ac7df28306cb297b7a7228bd1ae25e9a57f4ed5e0ab628c7"
-"checksum heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1679e6ea370dee694f91f1dc469bf94cf8f52051d147aec3e1f9497c6fc22461"
+"checksum heapsize 0.4.2 (git+https://github.com/cheme/heapsize.git?branch=ec-macfix)" = "<none>"
 "checksum heck 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea04fa3ead4e05e51a7c806fc07271fdbde4e246a6c6d1efd52e72230b771b82"
 "checksum hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d6a22814455d41612f41161581c2883c0c6a1c41852729b17d5ed88f01e153aa"
 "checksum hidapi 0.3.1 (git+https://github.com/paritytech/hidapi-rs)" = "<none>"
@@ -4467,6 +4493,8 @@ dependencies = [
 "checksum itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f58856976b776fedd95533137617a02fb25719f40e7d9b01c7043cd65474f450"
 "checksum itertools-num 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "83ca7b70b838f2e34bc6c2f367a1ed1cfe34fb82464adecadd31cdcc7da882fc"
 "checksum itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1306f3464951f30e30d12373d31c79fbd52d236e5e896fd92f96ec7babbbe60b"
+"checksum jemalloc-sys 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "bfc62c8e50e381768ce8ee0428ee53741929f7ebd73e4d83f669bcf7693e00ae"
+"checksum jemallocator 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "9f0cd42ac65f758063fea55126b0148b1ce0a6354ff78e07a4d6806bc65c4ab3"
 "checksum jni 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1ecfa3b81afc64d9a6539c4eece96ac9a93c551c713a313800dade8e33d7b5c1"
 "checksum jni-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8eaf4bc02d17cbdd7ff4c7438cafcdf7fb9a4613313ad11b4f8fefe7d3fa0130"
 "checksum jsonrpc-core 9.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-2.2)" = "<none>"
diff --git a/Cargo.toml b/Cargo.toml
index ba8758a7c..f1f4e7e45 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -133,3 +133,6 @@ members = [
 	"parity-clib",
 	"whisper/cli",
 ]
+
+[patch.crates-io]
+heapsize = { git = "https://github.com/cheme/heapsize.git", branch = "ec-macfix" }