diff --git a/src/sentry/search/events/builder/discover.py b/src/sentry/search/events/builder/discover.py
index 06856a3385feae..e1b94f227b6dea 100644
--- a/src/sentry/search/events/builder/discover.py
+++ b/src/sentry/search/events/builder/discover.py
@@ -1380,7 +1380,7 @@ def get_public_alias(self, function: CurriedFunction) -> str:
 
         ie. any_user_display -> any(user_display)
         """
-        return self.function_alias_map[function.alias].field
+        return self.function_alias_map.get(function.alias, function.alias).field
 
     def get_snql_query(self) -> Request:
         self.validate_having_clause()