diff --git a/Makefile b/Makefile
index 2ff9636105bfe0..1fa35574ed84d4 100644
--- a/Makefile
+++ b/Makefile
@@ -602,7 +602,7 @@ test-wpt: all
 test-wpt-report:
 	$(RM) -r out/wpt
 	mkdir -p out/wpt
-	WPT_REPORT=1 $(PYTHON) tools/test.py --shell $(NODE) $(PARALLEL_ARGS) wpt
+	-WPT_REPORT=1 $(PYTHON) tools/test.py --shell $(NODE) $(PARALLEL_ARGS) wpt
 	$(NODE) "$$PWD/tools/merge-wpt-reports.mjs"
 
 .PHONY: test-simple