diff --git a/client/CXWindowsSecondaryScreen.cpp b/client/CXWindowsSecondaryScreen.cpp
index c0cdffc1..668f4635 100644
--- a/client/CXWindowsSecondaryScreen.cpp
+++ b/client/CXWindowsSecondaryScreen.cpp
@@ -6,6 +6,7 @@
 #include <X11/X.h>
 #include <X11/Xutil.h>
 #define XK_MISCELLANY
+#define XK_XKB_KEYS
 #include <X11/keysymdef.h>
 #include <X11/extensions/XTest.h>
 
@@ -664,6 +665,10 @@ bool					CXWindowsSecondaryScreen::findKeyCode(
 			id = XK_Delete;
 			break;
 
+		case XK_ISO_Left_Tab:
+			id = XK_Tab;
+			break;
+
 		default:
 			return false;
 		}