1 files changed, 1 insertions, 0 deletions

diff --git a/uisimulator/win32/uisw32.h b/uisimulator/win32/uisw32.h
index e946654a72..d709e207f2 100644
--- a/uisimulator/win32/uisw32.h
+++ b/uisimulator/win32/uisw32.h
@@ -34,6 +34,7 @@
 
 extern HWND                         hGUIWnd; // the GUI window handle
 extern unsigned int                 uThreadID; // id of mod thread
+extern bool                         bActive;
 
 // typedefs
 typedef unsigned char               uchar;