diff --git a/WinPort/src/Backend/TTY/TTYInputSequenceParserExts.cpp b/WinPort/src/Backend/TTY/TTYInputSequenceParserExts.cpp
index 4938d50c3..329211f27 100644
--- a/WinPort/src/Backend/TTY/TTYInputSequenceParserExts.cpp
+++ b/WinPort/src/Backend/TTY/TTYInputSequenceParserExts.cpp
@@ -378,13 +378,26 @@ size_t TTYInputSequenceParser::TryParseAsKittyEscapeSequence(const char *s, size
 	if ((modif_state & KITTY_MOD_CAPSLOCK) && !(modif_state & KITTY_MOD_SHIFT)) {
 		// it's weird, but kitty can not give us uppercase utf8 in caps lock mode
 		// ("text-as-codepoints" mode should solve it, but it is not working for cyrillic chars for unknown reason)
-		ir.Event.KeyEvent.uChar.UnicodeChar = towupper(ir.Event.KeyEvent.uChar.UnicodeChar);
+		// ir.Event.KeyEvent.uChar.UnicodeChar = towupper(ir.Event.KeyEvent.uChar.UnicodeChar);
+		WINPORT(CharUpperBuff)(&ir.Event.KeyEvent.uChar.UnicodeChar, 1);
 	}
 
 	ir.Event.KeyEvent.bKeyDown = (event_type != KITTY_EVT_KEYUP) ? 1 : 0;
 
 	ir.Event.KeyEvent.wRepeatCount = 0;
 
+	if ((ir.Event.KeyEvent.dwControlKeyState & LEFT_ALT_PRESSED) ||
+		(ir.Event.KeyEvent.dwControlKeyState & RIGHT_ALT_PRESSED)) {
+		switch (ir.Event.KeyEvent.wVirtualKeyCode) {
+			case VK_ESCAPE: case VK_DELETE: case VK_BACK: case VK_TAB: case VK_RETURN: case VK_SPACE:
+				break;
+			default:
+				if (ir.Event.KeyEvent.uChar.UnicodeChar > 0) {
+					WINPORT(CharUpperBuff)(&ir.Event.KeyEvent.uChar.UnicodeChar, 1);
+				}
+		}
+	}
+
 	_ir_pending.emplace_back(ir);
 
 	if (!_using_extension) {
diff --git a/WinPort/src/Backend/WX/wxMain.cpp b/WinPort/src/Backend/WX/wxMain.cpp
index b12bf3b69..d8bc2c593 100644
--- a/WinPort/src/Backend/WX/wxMain.cpp
+++ b/WinPort/src/Backend/WX/wxMain.cpp
@@ -1621,8 +1621,8 @@ void WinPortPanel::OnChar( wxKeyEvent& event )
 			ir.Event.KeyEvent.wVirtualKeyCode = ir_tmp.Event.KeyEvent.wVirtualKeyCode;
 			ir.Event.KeyEvent.wVirtualScanCode = ir_tmp.Event.KeyEvent.wVirtualScanCode;
 			ir.Event.KeyEvent.dwControlKeyState = ir_tmp.Event.KeyEvent.dwControlKeyState;
-
 			ir.Event.KeyEvent.dwControlKeyState |= LEFT_ALT_PRESSED;
+			WINPORT(CharUpperBuff)(&ir.Event.KeyEvent.uChar.UnicodeChar, 1);
 		}
 #endif
 
@@ -1632,11 +1632,12 @@ void WinPortPanel::OnChar( wxKeyEvent& event )
 		ir.Event.KeyEvent.bKeyDown = FALSE;
 		wxConsoleInputShim::Enqueue(&ir, 1);
 
+		_enqueued_in_onchar = true;
+
 #if !defined(__WXOSX__)
 		// avoid double up event in ResetInputState()
 		wxKeyEvent keyEventCopy = _key_tracker.LastKeydown();
 		_key_tracker.OnKeyUp(keyEventCopy);
-		_enqueued_in_onchar = true;
 #endif
 	}
 	//event.Skip();