diff --git a/Makefile b/Makefile
index 3c35032..c5cd5c5 100644
--- a/Makefile
+++ b/Makefile
@@ -134,4 +134,5 @@ tarball:
 
 dist: tarball
 
+.NOTPARALLEL: %_easyjson.go
 .PHONY: src/signaling/continentmap.go