diff --git a/ios/TcpSocketClient.m b/ios/TcpSocketClient.m
index a31844f..009e5af 100644
--- a/ios/TcpSocketClient.m
+++ b/ios/TcpSocketClient.m
@@ -180,10 +180,10 @@ - (void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)msgTag
 - (void) writeData:(NSData *)data
           callback:(RCTResponseSenderBlock)callback
 {
-    [_tcpSocket writeData:data withTimeout:-1 tag:_sendTag];
     if (callback) {
         [self setPendingSend:callback forKey:@(_sendTag)];
     }
+    [_tcpSocket writeData:data withTimeout:-1 tag:_sendTag];
 
     _sendTag++;