diff --git a/desktop/pkg-lib/src/runBuild.ts b/desktop/pkg-lib/src/runBuild.ts
index 67a0eacaf..a5c8b91aa 100644
--- a/desktop/pkg-lib/src/runBuild.ts
+++ b/desktop/pkg-lib/src/runBuild.ts
@@ -29,32 +29,6 @@ async function getMetroDir() {
   return __dirname;
 }
 
-function hash(string: string) {
-  let hash = 0;
-  if (string.length === 0) {
-    return hash;
-  }
-  let chr;
-  for (let i = 0; i < string.length; i++) {
-    chr = string.charCodeAt(i);
-    hash = (hash << 5) - hash + chr;
-    hash |= 0;
-  }
-  return hash;
-}
-const fileToIdMap = new Map();
-const createModuleIdFactory = () => (filePath: string) => {
-  if (filePath === '__prelude__') {
-    return 0;
-  }
-  let id = fileToIdMap.get(filePath);
-  if (typeof id !== 'number') {
-    id = hash(filePath);
-    fileToIdMap.set(filePath, id);
-  }
-  return id;
-};
-
 export default async function runBuild(
   inputDirectory: string,
   entry: string,
@@ -72,7 +46,6 @@ export default async function runBuild(
       ...baseConfig.serializer,
       getRunModuleStatement: (moduleID: string) =>
         `module.exports = global.__r(${moduleID}).default;`,
-      createModuleIdFactory,
     },
     transformer: {
       ...baseConfig.transformer,