diff --git a/packages/schematics/src/collection/jest-project/files/tsconfig.spec.json b/packages/schematics/src/collection/jest-project/files/tsconfig.spec.json
index ae663e3996..c5ed826d2a 100644
--- a/packages/schematics/src/collection/jest-project/files/tsconfig.spec.json
+++ b/packages/schematics/src/collection/jest-project/files/tsconfig.spec.json
@@ -5,6 +5,6 @@
     "module": "commonjs",
     "types": ["jest", "node"]
   },
-  "files": [<% if(!skipSetupFile) { %>"src/test-setup.ts", <% } %>"src/polyfills.ts"],
+  <% if(!skipSetupFile) { %>"files": ["src/test-setup.ts"],<% } %>
   "include": ["**/*.spec.ts", "**/*.d.ts"]
 }
diff --git a/packages/schematics/src/collection/jest-project/jest-project.spec.ts b/packages/schematics/src/collection/jest-project/jest-project.spec.ts
index c95e9b2740..6e990d1083 100644
--- a/packages/schematics/src/collection/jest-project/jest-project.spec.ts
+++ b/packages/schematics/src/collection/jest-project/jest-project.spec.ts
@@ -94,7 +94,7 @@ describe('lib', () => {
         outDir: '../../dist/out-tsc/libs/lib1',
         types: ['jest', 'node']
       },
-      files: ['src/test-setup.ts', 'src/polyfills.ts'],
+      files: ['src/test-setup.ts'],
       include: ['**/*.spec.ts', '**/*.d.ts']
     });
   });
@@ -140,7 +140,7 @@ describe('lib', () => {
         resultTree,
         'libs/lib1/tsconfig.spec.json'
       );
-      expect(tsConfig.files).not.toContain('src/test-setup.ts');
+      expect(tsConfig.files).toBeUndefined();
     });
   });
 });