diff --git a/src/kernel/qapplication_x11.cpp b/src/kernel/qapplication_x11.cpp
index 5011351b..33806f0f 100644
--- a/src/kernel/qapplication_x11.cpp
+++ b/src/kernel/qapplication_x11.cpp
@@ -1632,6 +1632,12 @@ void qt_init_internal( int *argcptr, char **argv,
     setlocale( LC_ALL, "" );		// use correct char set mapping
     setlocale( LC_NUMERIC, "C" );	// make sprintf()/scanf() work
 
+#if defined(QT_THREAD_SUPPORT)
+    if ( qt_is_gui_used ) {
+	XInitThreads();
+    }
+#endif
+
     if ( display ) {
 	// TQt part of other application