diff --git a/abci/client/grpc_client.go b/abci/client/grpc_client.go
index 23d790550..8c444abc5 100644
--- a/abci/client/grpc_client.go
+++ b/abci/client/grpc_client.go
@@ -228,18 +228,22 @@ func (cli *grpcClient) finishAsyncCall(req *types.Request, res *types.Response)
 	reqres.Done()         // Release waiters
 	reqres.SetDone()      // so reqRes.SetCallback will run the callback
 
-	// go routine for callbacks
+	// goroutine for callbacks
 	go func() {
-		// Notify reqRes listener if set
-		if cb := reqres.GetCallback(); cb != nil {
-			cb(res)
-		}
+		cli.mtx.Lock()
+		defer cli.mtx.Unlock()
 
 		// Notify client listener if set
 		if cli.resCb != nil {
 			cli.resCb(reqres.Request, res)
 		}
+
+		// Notify reqRes listener if set
+		if cb := reqres.GetCallback(); cb != nil {
+			cb(res)
+		}
 	}()
+
 	return reqres
 }