diff --git a/Makefile b/Makefile
index 8a97ebf..07d5270 100644
--- a/Makefile
+++ b/Makefile
@@ -38,7 +38,7 @@ endif
 
 REPO := HariSekhon/GitHub-Commit-Times-Graph
 
-CODE_FILES := $(shell git ls-files | grep -E -e '\.sh$$' -e '\.py$$' | sort)
+CODE_FILES := $(shell git ls-files | grep -E -e '\.sh$$' -e '\.go$$' | sort)
 
 BINARY=github-commit-times