diff --git a/extensions/functions_cast.yaml b/extensions/functions_cast.yaml
deleted file mode 100644
index 245d27946..000000000
--- a/extensions/functions_cast.yaml
+++ /dev/null
@@ -1,11 +0,0 @@
-%YAML 1.2
----
-scalar_functions:
-  -
-    name: cast
-    description: Cast one type to another.
-    impls:
-      - args:
-          - value: any1
-          - type: output
-        return: output