1 files changed, 1 insertions, 1 deletions
diff --git a/src/msg.ts b/src/msg.ts
index 158fd8d..efbadb5 100644
--- a/src/msg.ts
+++ b/src/msg.ts
@@ -52,7 +52,7 @@ export class Msg<T> {
 export class MsgClient {
     requestCallback: {
         ids: number[],
-        inFlight: {[id: number]: (msg: Msg<any>) => any; },
+        inFlight: {[id: number]: (msg: Msg<any>) => void; },
         maxId: number
     };
     port: chrome.runtime.Port;