diff --git a/src/Utils.ts b/src/Utils.ts
index 7c86a774..0a934f36 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -81,7 +81,7 @@ export class Utils {
      * @param obj
      * @returns {T}
      */
-    public static strEnumify <T extends { [prop: string]: '' | string }> (obj: T): T {
+    public static strEnumify <T extends {[prop: string]: ''|string}> (obj: T): T {
         return obj;
     }