diff --git a/Makefile b/Makefile
index a8c915186..b9bedde05 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,10 @@ clean:	FORCE
 test:
 	for i in */Cargo.toml; do cd $$(dirname $$i); cargo test || exit 1; cd ..; done
 
+fmt:
+	set extglob; for i in */Cargo.toml; do cd $$(dirname $$i); rustfmt **/*.rs || exit 1; cd ..; done
+
+
 FORCE:
 
 .PHONY: test