diff --git a/modules/@angular/language-service/test/completions_spec.ts b/modules/@angular/language-service/test/completions_spec.ts
index d9f59adb28ee5..fde6f4e62d15c 100644
--- a/modules/@angular/language-service/test/completions_spec.ts
+++ b/modules/@angular/language-service/test/completions_spec.ts
@@ -96,7 +96,7 @@ describe('completions', () => {
           }
         } catch (e) {
           // Emit enough diagnostic information to reproduce the error.
-          console.log(
+          console.error(
               `Position: ${position}\nContent: "${mockHost.getFileContent(fileName)}"\nStack:\n${e.stack}`);
           throw e;
         }
diff --git a/modules/@angular/language-service/test/ts_plugin_spec.ts b/modules/@angular/language-service/test/ts_plugin_spec.ts
index d1b8106130553..759fb9fbd5eaa 100644
--- a/modules/@angular/language-service/test/ts_plugin_spec.ts
+++ b/modules/@angular/language-service/test/ts_plugin_spec.ts
@@ -255,9 +255,9 @@ function expectNoDiagnostics(diagnostics: ts.Diagnostic[]) {
     let message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
     if (diagnostic.start) {
       let {line, character} = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
-      console.log(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
+      console.error(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
     } else {
-      console.log(`${message}`);
+      console.error(`${message}`);
     }
   }
   expect(diagnostics.length).toBe(0);