diff --git a/gb.gtk/src/CScreen.cpp b/gb.gtk/src/CScreen.cpp
index 2249d8949..e824a1f56 100644
--- a/gb.gtk/src/CScreen.cpp
+++ b/gb.gtk/src/CScreen.cpp
@@ -199,6 +199,8 @@ BEGIN_PROPERTY(Application_Busy)
 	else
 	{
 		busy = VPROP(GB_INTEGER);
+		if (busy < 0)
+			busy = 0;
 
 		if (_busy == 0 && busy != 0)
 			gApplication::setBusy(true);
diff --git a/gb.qt4/src/CScreen.cpp b/gb.qt4/src/CScreen.cpp
index a48a66894..1a7c7775b 100644
--- a/gb.qt4/src/CScreen.cpp
+++ b/gb.qt4/src/CScreen.cpp
@@ -225,6 +225,8 @@ BEGIN_PROPERTY(Application_Busy)
 	else
 	{
 		busy = VPROP(GB_INTEGER);
+		if (busy < 0)
+			busy = 0;
 
 		if (screen_busy == 0 && busy > 0)
 			qApp->setOverrideCursor(Qt::WaitCursor);