diff --git a/src/audio/sfx_manager.cpp b/src/audio/sfx_manager.cpp
index e30178b12..13cb7c92a 100644
--- a/src/audio/sfx_manager.cpp
+++ b/src/audio/sfx_manager.cpp
@@ -414,6 +414,7 @@ void* SFXManager::mainLoop(void *obj)
         delete me->m_sfx_commands.getData().front();
         me->m_sfx_commands.getData().erase(me->m_sfx_commands.getData().begin());
     }
+    me->m_sfx_commands.unlock();
     return NULL;
 }   // mainLoop