diff --git a/Makefile b/Makefile
index e660649..531cd78 100644
--- a/Makefile
+++ b/Makefile
@@ -1,22 +1,22 @@
 # Author:	Louis Holbrook <dev@holbrook.no> 0826EDA1702D1E87C6E2875121D2E7BB88C2A746
 # SPDX-License-Identifier:	GPL-3.0-or-later
-# File-version: 3
+# File-version: 4
 
 INPUTS = $(wildcard *.sol)
 PREFIX = /usr/local/share/cic/solidity/abi
 
-%.abi: $(wildcard *.sol)
+%.abi.json: $(wildcard *.sol)
 	install -vDm0644 $@ $(PREFIX)/$@
 
 %.sol:
-	solc $@ --abi | awk 'NR>3' > $(basename $@).abi
+	solc $@ --abi | awk 'NR>3' > $(basename $@).abi.json
 
 # TODO: improve, does not detect changes in sol files (I suck at writing makefiles)
 all: $(INPUTS)
 
-install: $(wildcard *.abi)
+install: $(wildcard *.abi.json)
 
 clean:
-	rm -vf *.abi
+	rm -vf *.abi.json
 
 .PHONY: clean install