diff --git a/packages/webpack/src/plugin.ts b/packages/webpack/src/plugin.ts
index 4105c3f7cdbb..f6e95d7b3b5b 100644
--- a/packages/webpack/src/plugin.ts
+++ b/packages/webpack/src/plugin.ts
@@ -102,7 +102,8 @@ export class AotPlugin {
     }
 
     const tsConfig = tsc.readConfiguration(options.tsConfigPath, basePath);
-    this._rootFilePath = tsConfig.parsed.fileNames;
+    this._rootFilePath = tsConfig.parsed.fileNames
+      .filter(fileName => !/\.spec\.ts$/.test(fileName));
 
     // Check the genDir.
     let genDir = basePath;