diff --git a/dlls/winedos/module.c b/dlls/winedos/module.c
index 2d99d661e3d..9ecafb880fc 100644
--- a/dlls/winedos/module.c
+++ b/dlls/winedos/module.c
@@ -574,6 +574,14 @@ void WINAPI MZ_AllocDPMITask( void )
     ERR("Actual real-mode calls not supported on this platform!\n");
 }
 
+/***********************************************************************
+ *		MZ_RunInThread
+ */
+void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
+{
+    proc(arg);
+}
+
 /***********************************************************************
  *		MZ_Exit
  */