diff --git a/Makefile b/Makefile
index 27a4c9b..8e45c36 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ lint:
 	go vet ./...
 	staticcheck -f stylish ./...
 	shellcheck $(SCRIPTS)
-	shfmt $(SCRIPTS)
+	shfmt -w -i 4 $(SCRIPTS)
 	git diff --exit-code
 
 .INTERMEDIATE: coverage.out