diff --git a/packages/schematics/angular/library/index_spec.ts b/packages/schematics/angular/library/index_spec.ts
index 234b44f411d4..6220a07fa23c 100644
--- a/packages/schematics/angular/library/index_spec.ts
+++ b/packages/schematics/angular/library/index_spec.ts
@@ -25,7 +25,7 @@ describe('Library Schematic', () => {
   );
   const defaultOptions: GenerateLibrarySchema = {
     name: 'foo',
-    entryFile: 'my_index',
+    entryFile: 'my-index',
     skipPackageJson: false,
     skipTsConfig: false,
     skipInstall: false,
@@ -51,7 +51,7 @@ describe('Library Schematic', () => {
       '/projects/foo/README.md',
       '/projects/foo/tslint.json',
       '/projects/foo/src/test.ts',
-      '/projects/foo/src/my_index.ts',
+      '/projects/foo/src/my-index.ts',
       '/projects/foo/src/lib/foo.module.ts',
       '/projects/foo/src/lib/foo.component.spec.ts',
       '/projects/foo/src/lib/foo.component.ts',
@@ -89,7 +89,7 @@ describe('Library Schematic', () => {
     const tree = schematicRunner.runSchematic('library', defaultOptions, workspaceTree);
     const fileContent = getJsonFileContent(tree, '/projects/foo/ng-package.json');
     expect(fileContent.lib).toBeDefined();
-    expect(fileContent.lib.entryFile).toEqual('src/my_index.ts');
+    expect(fileContent.lib.entryFile).toEqual('src/my-index.ts');
     expect(fileContent.dest).toEqual('../../dist/foo');
   });
 
@@ -97,7 +97,7 @@ describe('Library Schematic', () => {
     const tree = schematicRunner.runSchematic('library', {
       name: 'foobar',
     }, workspaceTree);
-    expect(tree.files).toContain('/projects/foobar/src/public_api.ts');
+    expect(tree.files).toContain('/projects/foobar/src/public-api.ts');
   });
 
   it(`should add library to workspace`, () => {
diff --git a/packages/schematics/angular/library/schema.json b/packages/schematics/angular/library/schema.json
index 2739b644b174..d199c76eb893 100644
--- a/packages/schematics/angular/library/schema.json
+++ b/packages/schematics/angular/library/schema.json
@@ -19,7 +19,7 @@
       "type": "string",
       "format": "path",
       "description": "The path at which to create the library's public API file, relative to the workspace root.",
-      "default": "public_api"
+      "default": "public-api"
     },
     "prefix": {
       "type": "string",
diff --git a/tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/ng-package.json b/tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/ng-package.json
index 36fcf49d9c1b..cce46c5a8b7b 100644
--- a/tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/ng-package.json
+++ b/tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/ng-package.json
@@ -2,6 +2,6 @@
   "$schema": "../../../../../../node_modules/ng-packagr/ng-package.schema.json",
   "dest": "../../dist/lib",
   "lib": {
-    "entryFile": "src/public_api.ts"
+    "entryFile": "src/public-api.ts"
   }
 }
\ No newline at end of file
diff --git a/tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/src/public_api.ts b/tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/src/public-api.ts
similarity index 100%
rename from tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/src/public_api.ts
rename to tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/src/public-api.ts