diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index a0b894602d..f7642fa9c9 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -634,7 +634,9 @@ void QXcbConnection::processXcbEvents()
                 else
                     ++it;
             }
+            m_reader->unlock();
             handleXcbEvent(event);
+            m_reader->lock();
         }
 
         free(event);