diff --git a/src/blackcore/context/contextaudioimpl.cpp b/src/blackcore/context/contextaudioimpl.cpp
index d64c04760..a642e429e 100644
--- a/src/blackcore/context/contextaudioimpl.cpp
+++ b/src/blackcore/context/contextaudioimpl.cpp
@@ -322,7 +322,7 @@ namespace BlackCore
                     m_voiceChannelMapping.remove(BlackMisc::Aviation::CComSystem::Com1);
 
                     // If the voice channel is not used by anybody else
-                    if (!m_voiceChannelMapping.key(oldVoiceChannel))
+                    if (!m_voiceChannelMapping.values().contains(oldVoiceChannel))
                     {
                         oldVoiceChannel->leaveVoiceRoom();
                         m_unusedVoiceChannels.push_back(oldVoiceChannel);
@@ -337,7 +337,7 @@ namespace BlackCore
                 {
                     QSharedPointer<IVoiceChannel> newVoiceChannel = getVoiceChannelBy(newRoomCom1);
                     newVoiceChannel->setOwnAircraftCallsign(ownCallsign);
-                    bool inUse = m_voiceChannelMapping.key(newVoiceChannel);
+                    bool inUse = m_voiceChannelMapping.values().contains(newVoiceChannel);
                     m_voiceChannelMapping.insert(BlackMisc::Aviation::CComSystem::Com1, newVoiceChannel);
 
                     // If the voice channel is not used by anybody else
@@ -362,7 +362,7 @@ namespace BlackCore
                     m_voiceChannelMapping.remove(BlackMisc::Aviation::CComSystem::Com2);
 
                     // If the voice channel is not used by anybody else
-                    if (!m_voiceChannelMapping.key(oldVoiceChannel))
+                    if (!m_voiceChannelMapping.values().contains(oldVoiceChannel))
                     {
                         oldVoiceChannel->leaveVoiceRoom();
                         m_unusedVoiceChannels.push_back(oldVoiceChannel);
@@ -377,7 +377,7 @@ namespace BlackCore
                 {
                     auto newVoiceChannel = getVoiceChannelBy(newRoomCom2);
                     newVoiceChannel->setOwnAircraftCallsign(ownCallsign);
-                    bool inUse = m_voiceChannelMapping.key(newVoiceChannel);
+                    bool inUse = m_voiceChannelMapping.values().contains(newVoiceChannel);
                     m_voiceChannelMapping.insert(BlackMisc::Aviation::CComSystem::Com2, newVoiceChannel);
 
                     // If the voice channel is not used by anybody else