diff --git a/ts/textsecure/WebAPI.ts b/ts/textsecure/WebAPI.ts
index 462455ebd0..2293148177 100644
--- a/ts/textsecure/WebAPI.ts
+++ b/ts/textsecure/WebAPI.ts
@@ -1102,7 +1102,7 @@ export function initialize({
           // Happens sometimes when we get no response. Might be nice to get 204 instead.
           return null;
         }
-        let message;
+        let message: string;
         switch (code) {
           case -1:
             message =