diff --git a/Makefile b/Makefile
index f03ae7931..9bde1bfb1 100644
--- a/Makefile
+++ b/Makefile
@@ -148,6 +148,7 @@ clean:
 	$(Q) $(RM) -f ./$(HEAD-BLOB-GEN)
 	$(Q) $(RM) -f ./$(RHEAD-BLOB-GEN)
 	$(Q) $(MAKE) -C test/legacy clean
+	$(Q) $(MAKE) -C test/zdtm cleandep
 	$(Q) $(MAKE) -C test/zdtm clean
 .PHONY: clean