diff --git a/mk/check.mk b/mk/check.mk
index 40840a6440a..adf8b468ce0 100644
--- a/mk/check.mk
+++ b/mk/check.mk
@@ -77,7 +77,7 @@ check-ref: reftest
 .PHONY: check-content
 check-content: contenttest
 	@$(call E, check: contenttests)
-	$(Q)./contenttest --source-dir=$(S)src/test/html/content $(TESTNAME)
+	$(Q)RUST_TEST_TASKS=1 ./contenttest --source-dir=$(S)src/test/html/content $(TESTNAME)
 
 .PHONY: tidy
 tidy: