diff --git a/tools/makefile b/tools/makefile
index 6fbe4f2..570f581 100644
--- a/tools/makefile
+++ b/tools/makefile
@@ -20,6 +20,7 @@ default: node_modules ${dir_build}/aum
 
 .PHONY: node_modules
 node_modules:
+	@ ${cmd_mkdir} ${dir_build}/node_modules
 	@ ${cmd_log} "node modules …"
 	@ ${cmd_cp} -r -u ${dir_lib}/node/node_modules/* ${dir_build}/node_modules/