diff --git a/types/moment-timezone/index.d.ts b/types/moment-timezone/index.d.ts
index 48eae90088..fac79f728f 100644
--- a/types/moment-timezone/index.d.ts
+++ b/types/moment-timezone/index.d.ts
@@ -58,7 +58,7 @@ declare module "moment" {
 
     interface Moment {
         tz(): string | undefined;
-        tz(timezone: string): Moment;
+        tz(timezone: string, keepLocalTime?: boolean): Moment;
         zoneAbbr(): string;
         zoneName(): string;
     }
diff --git a/types/moment-timezone/moment-timezone-tests.ts b/types/moment-timezone/moment-timezone-tests.ts
index 44b00abf10..9daffd1ba2 100644
--- a/types/moment-timezone/moment-timezone-tests.ts
+++ b/types/moment-timezone/moment-timezone-tests.ts
@@ -23,6 +23,7 @@ const language = "en";
 
 moment.tz();
 moment.tz("America/Los_Angeles");
+moment.tz("America/Los_Angeles").tz("Asia/Tomsk", true);
 
 moment.tz(num, "America/Los_Angeles");
 moment.tz(arr, "America/Los_Angeles");