diff --git a/command-parser.js b/command-parser.js
index 8d204ea16e..89ee230d70 100644
--- a/command-parser.js
+++ b/command-parser.js
@@ -601,7 +601,7 @@ exports.uncacheTree = function (root) {
 		for (let i = 0; i < uncache.length; ++i) {
 			if (require.cache[uncache[i]]) {
 				newuncache.push.apply(newuncache,
-					require.cache[uncache[i]].children.map(toId)
+					require.cache[uncache[i]].children.map(cachedModule => cachedModule.id)
 				);
 				delete require.cache[uncache[i]];
 			}