diff --git a/uppsrc/CtrlCore/TopWinX11.cpp b/uppsrc/CtrlCore/TopWinX11.cpp
index 9f7dbcb7a..deea6f181 100644
--- a/uppsrc/CtrlCore/TopWinX11.cpp
+++ b/uppsrc/CtrlCore/TopWinX11.cpp
@@ -77,7 +77,7 @@ void TopWindow::DefSyncTitle()
 	}
 }
 
-void TopWindow::SyncTitle()
+void TopWindow::SyncTitle0()
 {
 	GuiLock __; 
 	LLOG("SyncTitle: " << title);
diff --git a/uppsrc/CtrlCore/X11App.cpp b/uppsrc/CtrlCore/X11App.cpp
index 9cdd7be12..6e0438702 100644
--- a/uppsrc/CtrlCore/X11App.cpp
+++ b/uppsrc/CtrlCore/X11App.cpp
@@ -370,6 +370,10 @@ void SetX11ErrorHandler()
 	XSetErrorHandler(X11ErrorHandler);
 }
 
+void WakeUpGuiThread()
+{
+}
+
 void Ctrl::InitX11(const char *display)
 {
 	GuiLock __; 
diff --git a/uppsrc/CtrlCore/X11Wnd.cpp b/uppsrc/CtrlCore/X11Wnd.cpp
index 5acb5811a..c1ed0fa09 100644
--- a/uppsrc/CtrlCore/X11Wnd.cpp
+++ b/uppsrc/CtrlCore/X11Wnd.cpp
@@ -300,9 +300,10 @@ bool Ctrl::ProcessEvents(bool *)
 	return false;
 }
 
-void Ctrl::GuiSleep0(int ms)
+void Ctrl::GuiSleep(int ms)
 {
 	GuiLock __;
+	ASSERT(IsMainThread());
 	fd_set fdset;
 	FD_ZERO(&fdset);
 	FD_SET(Xconnection, &fdset);
@@ -315,11 +316,6 @@ void Ctrl::GuiSleep0(int ms)
 	EnterGuiMutex(level);
 }
 
-void Ctrl::GuiSleep(int ms)
-{
-	Call(&Ctrl::GuiSleep0, ms);
-}
-
 static int granularity = 10;
 
 void Ctrl::SetTimerGranularity(int ms)