diff --git a/packages/compiler-cli/ngcc/src/writing/new_entry_point_file_writer.ts b/packages/compiler-cli/ngcc/src/writing/new_entry_point_file_writer.ts
index 5a2ce315af..c4aea4b16f 100644
--- a/packages/compiler-cli/ngcc/src/writing/new_entry_point_file_writer.ts
+++ b/packages/compiler-cli/ngcc/src/writing/new_entry_point_file_writer.ts
@@ -43,10 +43,12 @@ export class NewEntryPointFileWriter extends InPlaceFileWriter {
   protected copyBundle(
       bundle: EntryPointBundle, entryPointPath: AbsoluteFsPath, newDir: AbsoluteFsPath) {
     bundle.src.program.getSourceFiles().forEach(sourceFile => {
-      const relativePath = relative(entryPointPath, sourceFile.fileName);
-      const newFilePath = join(newDir, relativePath);
-      mkdir('-p', dirname(newFilePath));
-      cp(sourceFile.fileName, newFilePath);
+      if (!sourceFile.isDeclarationFile) {
+        const relativePath = relative(entryPointPath, sourceFile.fileName);
+        const newFilePath = join(newDir, relativePath);
+        mkdir('-p', dirname(newFilePath));
+        cp(sourceFile.fileName, newFilePath);
+      }
     });
   }
 
diff --git a/packages/compiler-cli/ngcc/test/writing/new_entry_point_file_writer_spec.ts b/packages/compiler-cli/ngcc/test/writing/new_entry_point_file_writer_spec.ts
index 0d3815031e..210379159d 100644
--- a/packages/compiler-cli/ngcc/test/writing/new_entry_point_file_writer_spec.ts
+++ b/packages/compiler-cli/ngcc/test/writing/new_entry_point_file_writer_spec.ts
@@ -52,7 +52,7 @@ function createMockFileSystem() {
       'lib': {
         'esm5.js': 'export function FooB() {}',
         'es2015': {
-          'index.js': 'import {FooB} from "./foo";',
+          'index.js': 'import {FooB} from "./foo"; import * from "other";',
           'foo.js': 'export class FooB {}',
         },
       },
@@ -61,6 +61,11 @@ function createMockFileSystem() {
         'index.metadata.json': '...',
       }
     },
+    '/node_modules/other': {
+      'package.json': '{"module": "./esm5.js", "typings": "./index.d.ts"}',
+      'index.d.ts': 'export declare class OtherClass {}',
+      'esm5.js': 'export class OtherClass {}',
+    },
   });
 }
 
@@ -250,9 +255,19 @@ describe('NewEntryPointFileWriter', () => {
       expect(readFileSync('/node_modules/test/lib/es2015/foo.js', 'utf8'))
           .toEqual('export class FooB {}');
       expect(readFileSync('/node_modules/test/__ivy_ngcc__/lib/es2015/index.js', 'utf8'))
-          .toEqual('import {FooB} from "./foo";');
+          .toEqual('import {FooB} from "./foo"; import * from "other";');
       expect(readFileSync('/node_modules/test/lib/es2015/index.js', 'utf8'))
-          .toEqual('import {FooB} from "./foo";');
+          .toEqual('import {FooB} from "./foo"; import * from "other";');
+    });
+
+    it('should not copy declaration files outside of the entry-point', () => {
+      fileWriter.writeBundle(entryPoint, esm2015bundle, [
+        {
+          path: '/node_modules/test/lib/es2015/foo.js',
+          contents: 'export class FooB {} // MODIFIED'
+        },
+      ]);
+      expect(existsSync('/node_modules/test/other/index.d.ts')).toEqual(false);
     });
 
     it('should update the package.json properties', () => {