diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index 84a56a1ac..9d9f574c1 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -116,7 +116,7 @@ evm-debug-tests = ["evm-debug", "evm/evm-debug-tests"]
 # EVM debug traces are printed.
 slow-blocks = []
 # Run JSON consensus tests.
-json-tests = ["env_logger", "test-helpers", "lazy_static", "machine/test-helpers"]
+json-tests = ["env_logger", "test-helpers", "lazy_static", "machine/test-helpers", "common-types/test-helpers"]
 # Run memory/cpu heavy tests.
 test-heavy = []
 # Compile test helpers