diff --git a/flow/Makefile b/flow/Makefile
index 16d8ae8be5..7227ad3214 100644
--- a/flow/Makefile
+++ b/flow/Makefile
@@ -673,7 +673,7 @@ $(WRAPPED_GDSOAS): $(OBJECTS_DIR)/klayout_wrap.lyt $(WRAPPED_LEFS)
 
 # Merge GDS using Klayout
 #-------------------------------------------------------------------------------
-$(GDS_MERGED_FILE): check-klayout $(RESULTS_DIR)/6_final.def $(OBJECTS_DIR)/klayout.lyt $(GDSOAS_FILES) $(WRAPPED_GDSOAS) $(SEAL_GDSOAS)
+$(GDS_MERGED_FILE): $(RESULTS_DIR)/6_final.def $(OBJECTS_DIR)/klayout.lyt $(GDSOAS_FILES) $(WRAPPED_GDSOAS) $(SEAL_GDSOAS) | check-klayout
 	$(UNSET_AND_MAKE) do-gds-merged
 
 .PHONY: do-gds-merged