diff --git a/Makefile b/Makefile
index 6e17cd51..735edea7 100644
--- a/Makefile
+++ b/Makefile
@@ -166,4 +166,5 @@ dist: tarball
 
 .NOTPARALLEL: $(EASYJSON_GO_FILES)
 .PHONY: continentmap.go common vendor
+.SECONDARY: $(EASYJSON_GO_FILES) $(PROTO_GO_FILES)
 .DELETE_ON_ERROR: