diff --git a/udphandler.cpp b/udphandler.cpp
index fc7ecbf..65ce54d 100644
--- a/udphandler.cpp
+++ b/udphandler.cpp
@@ -1419,7 +1419,8 @@ void udpBase::sendRetransmitRequest()
     QByteArray missingSeqs;
 
     missingMutex.lock();
-    for (auto it = rxMissing.begin(); it != rxMissing.end(); ++it)
+    auto it = rxMissing.begin();
+    while (it != rxMissing.end())
     {
         if (it.key() != 0x0)
         {
diff --git a/udpserver.cpp b/udpserver.cpp
index 3a178af..2158451 100644
--- a/udpserver.cpp
+++ b/udpserver.cpp
@@ -1713,7 +1713,8 @@ void udpServer::sendRetransmitRequest(CLIENT* c)
 
     if (c->missMutex.try_lock_for(std::chrono::milliseconds(LOCK_PERIOD)))
     {
-        for (auto it = c->rxMissing.begin(); it != c->rxMissing.end(); ++it)
+        auto it = c->rxMissing.begin();
+        while (it != c->rxMissing.end())
         {
             if (it.key() != 0x00)
             {