diff --git a/gb.qt4/src/CWidget.cpp b/gb.qt4/src/CWidget.cpp
index b5d952d81..9860f171e 100644
--- a/gb.qt4/src/CWidget.cpp
+++ b/gb.qt4/src/CWidget.cpp
@@ -2898,6 +2898,20 @@ bool CWidget::eventFilter(QObject *widget, QEvent *event)
 	{
 		QKeyEvent *kevent = (QKeyEvent *)event;
 
+		if (MAIN_key_debug)
+		{
+#ifdef QT5
+			qDebug("gb.qt5"
+#else
+			qDebug("gb.qt4"
+#endif
+				": %s: real = %d original = %d no_keyboard = %d",
+				(type == QEvent::KeyRelease ? "KeyRelease" :
+				type == QEvent::KeyPress ? "KeyPress" :
+				type == QEvent::InputMethod ? "InputMethod" : "?"),
+				real, original, control->flag.no_keyboard);
+		}
+		
 		#if QT_VERSION <= 0x030005
 		if (!real || !original)
 			goto _DESIGN;
diff --git a/gb.qt4/src/main.cpp b/gb.qt4/src/main.cpp
index 681217034..fed115952 100644
--- a/gb.qt4/src/main.cpp
+++ b/gb.qt4/src/main.cpp
@@ -131,6 +131,7 @@ int MAIN_x11_last_key_code = 0;
 #endif
 bool MAIN_debug_busy = false;
 bool MAIN_init = false;
+bool MAIN_key_debug = false;
 
 GB_CLASS CLASS_Control;
 GB_CLASS CLASS_Container;
@@ -875,6 +876,7 @@ static void QT_Init(void)
 {
 	static bool init = false;
 	QFont f;
+	char *env;
 
 	if (init)
 		return;
@@ -890,7 +892,7 @@ static void QT_Init(void)
 
 	if (::strcmp(qApp->style()->metaObject()->className(), "Breeze::Style") == 0)
 	{
-		char *env = getenv("GB_QT_NO_BREEZE_FIX");
+		env = getenv("GB_QT_NO_BREEZE_FIX");
 		if (!env || atoi(env) == 0)
 		{
 			CSTYLE_fix_breeze = TRUE;
@@ -899,7 +901,7 @@ static void QT_Init(void)
 	}
 	else if (::strcmp(qApp->style()->metaObject()->className(), "Oxygen::Style") == 0)
 	{
-		char *env = getenv("GB_QT_NO_OXYGEN_FIX");
+		env = getenv("GB_QT_NO_OXYGEN_FIX");
 		if (!env || atoi(env) == 0)
 		{
 			CSTYLE_fix_oxygen = TRUE;
@@ -928,6 +930,10 @@ static void QT_Init(void)
 
 	MyApplication::initClipboard();
 
+	env = getenv("GB_QT_KEY_DEBUG");
+	if (env && atoi(env) != 0)
+		MAIN_key_debug = TRUE;
+	
 	init = true;
 }
 
diff --git a/gb.qt4/src/main.h b/gb.qt4/src/main.h
index 922dc1be8..6cf6ca28c 100644
--- a/gb.qt4/src/main.h
+++ b/gb.qt4/src/main.h
@@ -51,6 +51,7 @@ extern int MAIN_loop_level;
 extern int MAIN_scale;
 extern bool MAIN_debug_busy;
 extern bool MAIN_init;
+extern bool MAIN_key_debug;
 #ifndef NO_X_WINDOW
 extern int MAIN_x11_last_key_code;
 #endif