diff --git a/moment-timezone/moment-timezone.d.ts b/moment-timezone/moment-timezone.d.ts
index 5e1ea09be..407f99d5d 100644
--- a/moment-timezone/moment-timezone.d.ts
+++ b/moment-timezone/moment-timezone.d.ts
@@ -68,6 +68,7 @@ interface MomentTimezone {
     }): void;
 
     names(): string[];
+    guess(): MomentZone;
 
     setDefault(timezone: string): void;
 }