diff --git a/src/run-context.ts b/src/run-context.ts
index 0e7929e..b9fc3d2 100644
--- a/src/run-context.ts
+++ b/src/run-context.ts
@@ -417,7 +417,7 @@ export class RunContextBase<GeneratorType extends BaseGenerator = DefaultGenerat
       env.on('compose', (_namespace, generator) => {
         const createCallback = method =>
           function (this: any, ...args) {
-            stub.call(this, method, ...args);
+            return stub.call(this, method, ...args);
           };
 
         generator.spawnCommand = createCallback('spawnCommand');