diff --git a/src/plugins/platforms/windows/qwindowskeymapper.cpp b/src/plugins/platforms/windows/qwindowskeymapper.cpp
index 5790341dbf..403ac6ecfb 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.cpp
+++ b/src/plugins/platforms/windows/qwindowskeymapper.cpp
@@ -1247,7 +1247,12 @@ QList<int> QWindowsKeyMapper::possibleKeys(const QKeyEvent *e) const
 {
     QList<int> result;
 
-    const KeyboardLayoutItem &kbItem = keyLayout[e->nativeVirtualKey()];
+
+    const quint32 nativeVirtualKey = e->nativeVirtualKey();
+    if (nativeVirtualKey > 255)
+        return result;
+
+    const KeyboardLayoutItem &kbItem = keyLayout[nativeVirtualKey];
     if (!kbItem.exists)
         return result;