diff --git a/Makefile b/Makefile
index f3b0209..880626a 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ build:
 fmt:
 	@gofumpt -l -w .
 	@gofmt -s -w .
-	@gci write --custom-order -s "standard,prefix(github.com/sagernet/),default" .
+	@gci write --custom-order -s standard -s "prefix(github.com/sagernet/)" -s "default" .
 
 fmt_install:
 	go install -v mvdan.cc/gofumpt@latest