diff --git a/Makefile b/Makefile
index a87f94113..cba52fd4b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SOURCE_FILES?=$$(go list ./... | grep -v /vendor/)
+SOURCE_FILES?=./...
 TEST_PATTERN?=.
 TEST_OPTIONS?=