diff --git a/packages/language-service/src/typescript_host.ts b/packages/language-service/src/typescript_host.ts
index 59facc4b0c..28197c24f5 100644
--- a/packages/language-service/src/typescript_host.ts
+++ b/packages/language-service/src/typescript_host.ts
@@ -492,7 +492,7 @@ export class TypeScriptServiceHost implements LanguageServiceHost {
             const type = this.checker.getTypeAtLocation(target);
             if (type) {
               const staticSymbol =
-                  this._reflector.getStaticSymbol(sourceFile.fileName, classDeclaration.name.text);
+                  this.reflector.getStaticSymbol(sourceFile.fileName, classDeclaration.name.text);
               try {
                 if (this.resolver.isDirective(staticSymbol as any)) {
                   const {metadata} =
diff --git a/packages/language-service/test/diagnostics_spec.ts b/packages/language-service/test/diagnostics_spec.ts
index c0df4daf63..7a4dc1147f 100644
--- a/packages/language-service/test/diagnostics_spec.ts
+++ b/packages/language-service/test/diagnostics_spec.ts
@@ -52,6 +52,15 @@ describe('diagnostics', () => {
       includeDiagnostic(diagnostics(template), message, at, len);
     }
 
+    describe('regression', () => {
+      it('should be able to return diagnostics if reflector gets invalidated', () => {
+        const fileName = '/app/main.ts';
+        ngService.getDiagnostics(fileName);
+        (ngHost as any)._reflector = null;
+        ngService.getDiagnostics(fileName);
+      });
+    });
+
     describe('with $event', () => {
       it('should accept an event',
          () => { accept('<div (click)="myClick($event)">Click me!</div>'); });