diff --git a/moment-timezone/moment-timezone.d.ts b/moment-timezone/moment-timezone.d.ts
index 42dd4b9f7a..77c2792bd2 100644
--- a/moment-timezone/moment-timezone.d.ts
+++ b/moment-timezone/moment-timezone.d.ts
@@ -70,7 +70,7 @@ interface MomentTimezone {
     }): void;
 
     names(): string[];
-    guess(): MomentZone;
+    guess(): string;
 
     setDefault(timezone: string): void;
 }