diff --git a/tabbox/tabbox.cpp b/tabbox/tabbox.cpp
--- a/tabbox/tabbox.cpp
+++ b/tabbox/tabbox.cpp
@@ -935,34 +935,34 @@
 
     for (int iKeySym = 0; iKeySym < nKeySyms; iKeySym++) {
         uint keySymX = keySyms[ iKeySym ];
-        xcb_keycode_t *keyCodes = xcb_key_symbols_get_keycode(symbols.data(), keySymX);
+        QScopedPointer<xcb_keycode_t, QScopedPointerPodDeleter> keyCodes(
+            xcb_key_symbols_get_keycode(symbols.data(), keySymX));
         if (!keyCodes) {
             continue;
         }
-        xcb_keycode_t keyCodeX = keyCodes[0];
-        free(keyCodes);
-        if (keyCodeX == XCB_NO_SYMBOL) {
-            continue;
-        }
-        int i = keyCodeX / 8;
-        char mask = 1 << (keyCodeX - (i * 8));
-
-        // Abort if bad index value,
-        if (i < 0 || i >= 32)
-            return false;
+        int j = 0;
+        while (keyCodes.data()[j] != XCB_NO_SYMBOL) {
+            xcb_keycode_t keyCodeX = keyCodes.data()[j++];
+            int i = keyCodeX / 8;
+            char mask = 1 << (keyCodeX - (i * 8));
+
+            // Abort if bad index value,
+            if (i < 0 || i >= 32)
+                return false;
 
-        qCDebug(KWIN_TABBOX)    << iKeySym << ": keySymX=0x" << QString::number(keySymX, 16)
-                    << " i=" << i << " mask=0x" << QString::number(mask, 16)
-                    << " keymap[i]=0x" << QString::number(keymap[i], 16);
+            qCDebug(KWIN_TABBOX)    << iKeySym << ": keySymX=0x" << QString::number(keySymX, 16)
+                        << " i=" << i << " mask=0x" << QString::number(mask, 16)
+                        << " keymap[i]=0x" << QString::number(keymap[i], 16);
 
-        // If ALL keys passed need to be depressed,
-        if (bAll) {
-            if ((keymap[i] & mask) == 0)
-                return false;
-        } else {
-            // If we are looking for ANY key press, and this key is depressed,
-            if (keymap[i] & mask)
-                return true;
+            // If ALL keys passed need to be depressed,
+            if (bAll) {
+                if ((keymap[i] & mask) == 0)
+                    return false;
+            } else {
+                // If we are looking for ANY key press, and this key is depressed,
+                if (keymap[i] & mask)
+                    return true;
+            }
         }
     }