diff --git a/scripts/validate_content.py b/scripts/validate_content.py
index edeb641..ceff4b0 100644
--- a/scripts/validate_content.py
+++ b/scripts/validate_content.py
@@ -495,11 +495,6 @@ def _prototype_ability_catalog_gate(seen_ids: dict[str, str]) -> str | None:
     return None
 
 
-def _prototype_e5m1_ability_gate(seen_ids: dict[str, str]) -> str | None:
-    """Backward-compatible alias for the combined prototype ability catalog gate."""
-    return _prototype_ability_catalog_gate(seen_ids)
-
-
 def _validate_npc_behavior_catalogs(
     *,
     npc_behavior_files: list[Path],