diff --git a/packages/angular_devkit/build_angular/src/utils/process-bundle.ts b/packages/angular_devkit/build_angular/src/utils/process-bundle.ts
index 09a25e1facb6..d4c0e994f8b4 100644
--- a/packages/angular_devkit/build_angular/src/utils/process-bundle.ts
+++ b/packages/angular_devkit/build_angular/src/utils/process-bundle.ts
@@ -413,7 +413,7 @@ async function terserMangle(
       code,
       options.map,
       outputCode,
-      (minifyOutput.map as unknown) as RawSourceMap,
+      minifyOutput.map as unknown as RawSourceMap,
       options.filename || '0',
       code.length > FAST_SOURCEMAP_THRESHOLD,
     );