diff --git a/src/services/refactors/annotateWithTypeFromJSDoc.ts b/src/services/refactors/annotateWithTypeFromJSDoc.ts
index 17d910b3091..60c0517f681 100644
--- a/src/services/refactors/annotateWithTypeFromJSDoc.ts
+++ b/src/services/refactors/annotateWithTypeFromJSDoc.ts
@@ -126,7 +126,7 @@ namespace ts.refactor.annotateWithTypeFromJSDoc {
             case SyntaxKind.SetAccessor:
                 return createSetAccessor(decl.decorators, decl.modifiers, decl.name, parameters, decl.body);
             default:
-                return Debug.assertNever(decl,`Unexpected SyntaxKind: ${(decl as any).kind}`);
+                return Debug.assertNever(decl, `Unexpected SyntaxKind: ${(decl as any).kind}`);
         }
     }