diff --git a/Makefile b/Makefile
index 37cf33c18..346e9649a 100644
--- a/Makefile
+++ b/Makefile
@@ -23,4 +23,4 @@ race: fmt
 	prefix "$@" ./ci/test.sh --race ./...
 .PHONY: js
 js: gen
-	cd d2js/js && prefix "$@" ./make.sh all
+	cd d2js/js && NPM_VERSION="${NPM_VERSION}" prefix "$@" ./make.sh all