diff --git a/tests/integration.mk b/tests/integration.mk
index fc96789e170e424c62a1b99838becbd3b92f2491..1f3d178b79e95a02422e0bfd1555e78c6a24646e 100644
--- a/tests/integration.mk
+++ b/tests/integration.mk
@@ -22,7 +22,7 @@ $(libfaketime_DIR)/Makefile: $(libfaketime_DIR)
 	@git submodule update
 # Build libfaketime contrib
 $(libfaketime): $(libfaketime_DIR)/Makefile
-	@$(MAKE) -C $(libfaketime_DIR)
+	@CFLAGS="" $(MAKE) -C $(libfaketime_DIR)
 
 check-integration: $(libfaketime)
 	$(preload_LIBS) $(preload_syms) tests/test_integration.py tests/testdata