diff --git a/Makefile b/Makefile
index ba09b93c26e..3faf405a795 100644
--- a/Makefile
+++ b/Makefile
@@ -83,9 +83,7 @@ clean:
 	rm -rf target
 
 clean-all: clean
-	cd libs/hamcrest-rust && make clean
-	cd libs/hammer.rs && make clean
-	cd libs/toml-rs && make clean
+	git submodule foreach make clean
 
 install:
 	install -d $(DESTDIR)$(BINDIR)