diff --git a/Makefile b/Makefile
index de48f8d..af6a256 100644
--- a/Makefile
+++ b/Makefile
@@ -2,4 +2,4 @@ default:
 
 auto-hook-pre-commit:
 	git status --porcelain | grep -q '^.M filters.txt' && python3 checksum.py || true
-	git status --porcelain | grep -q '^M  filters.txt' && git add filters.txt || true
+	git status --porcelain | grep -q '^M. filters.txt' && git add filters.txt || true