diff --git a/evennia/contrib/rpg/rpsystem/rpsystem.py b/evennia/contrib/rpg/rpsystem/rpsystem.py
index d6085e1bfd..083d664976 100644
--- a/evennia/contrib/rpg/rpsystem/rpsystem.py
+++ b/evennia/contrib/rpg/rpsystem/rpsystem.py
@@ -318,15 +318,16 @@ def regex_tuple_from_key_alias(obj):
 
     """
     global _REGEX_TUPLE_CACHE
+    permutation_string = " ".join([obj.key] + obj.aliases.all())
+    cache_key = " ".join((obj.id, permutation_string))
 
-    if obj.id not in _REGEX_TUPLE_CACHE:
-        permutation_string = " ".join([obj.key] + obj.aliases.all())
-        _REGEX_TUPLE_CACHE[obj.id] = (
+    if cache_key not in _REGEX_TUPLE_CACHE:
+        _REGEX_TUPLE_CACHE[cache_key] = (
             re.compile(ordered_permutation_regex(permutation_string), _RE_FLAGS),
             obj,
             obj.key,
         )
-    return _REGEX_TUPLE_CACHE[obj.id]
+    return _REGEX_TUPLE_CACHE[cache_key]
 
 
 def parse_language(speaker, emote):