diff --git a/crates/sb_workers/user_workers.js b/crates/sb_workers/user_workers.js
index 9edebd24..1dd41fb2 100644
--- a/crates/sb_workers/user_workers.js
+++ b/crates/sb_workers/user_workers.js
@@ -71,7 +71,7 @@ class UserWorker {
 			envVars: [],
 			forceCreate: false,
 			netAccessDisabled: false,
-			customModuleRoot: null,
+			customModuleRoot: '',
 			...opts,
 		};
 
diff --git a/examples/main/index.ts b/examples/main/index.ts
index b1f9658e..da9466e0 100644
--- a/examples/main/index.ts
+++ b/examples/main/index.ts
@@ -32,7 +32,6 @@ serve(async (req: Request) => {
 		const memoryLimitMb = 150;
 		const workerTimeoutMs = 5 * 60 * 1000;
 		const noModuleCache = false;
-		const customModuleRoot = null;
 		// you can provide an import map inline
 		// const inlineImportMap = {
 		//   imports: {
@@ -55,7 +54,6 @@ serve(async (req: Request) => {
 			importMapPath,
 			envVars,
 			forceCreate,
-			customModuleRoot,
 			netAccessDisabled,
 		});
 	};