diff --git a/video/out/wayland_common.c b/video/out/wayland_common.c
index e80d32a326..47d317e42b 100644
--- a/video/out/wayland_common.c
+++ b/video/out/wayland_common.c
@@ -2423,11 +2423,10 @@ static int lookupkey(int key)
         mpkey = lookup_keymap_table(keymap, key);
 
     // XFree86 keysym range; typically contains obscure "extra" keys
-    if (!mpkey && key >= 0x10080001 && key <= 0x1008FFFF) {
+    static_assert(MP_KEY_UNKNOWN_RESERVED_START + (0x1008FFFF - 0x10080000) <=
+                  MP_KEY_UNKNOWN_RESERVED_LAST, "");
+    if (!mpkey && key >= 0x10080001 && key <= 0x1008FFFF)
         mpkey = MP_KEY_UNKNOWN_RESERVED_START + (key - 0x10080000);
-        if (mpkey > MP_KEY_UNKNOWN_RESERVED_LAST)
-            mpkey = 0;
-    }
 
     return mpkey;
 }
diff --git a/video/out/x11_common.c b/video/out/x11_common.c
index 52e661f3f8..7099199e3a 100644
--- a/video/out/x11_common.c
+++ b/video/out/x11_common.c
@@ -831,11 +831,10 @@ static int vo_x11_lookupkey(int key)
         mpkey = lookup_keymap_table(keymap, key);
 
     // XFree86 keysym range; typically contains obscure "extra" keys
-    if (!mpkey && key >= 0x10080001 && key <= 0x1008FFFF) {
+    static_assert(MP_KEY_UNKNOWN_RESERVED_START + (0x1008FFFF - 0x10080000) <=
+                  MP_KEY_UNKNOWN_RESERVED_LAST, "");
+    if (!mpkey && key >= 0x10080001 && key <= 0x1008FFFF)
         mpkey = MP_KEY_UNKNOWN_RESERVED_START + (key - 0x10080000);
-        if (mpkey > MP_KEY_UNKNOWN_RESERVED_LAST)
-            mpkey = 0;
-    }
 
     return mpkey;
 }