diff --git a/Cargo.lock b/Cargo.lock
index 23a0ef3c..6a89a571 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -81,7 +81,7 @@ dependencies = [
 
 [[package]]
 name = "calcit_runner"
-version = "0.4.15"
+version = "0.4.16"
 dependencies = [
  "chrono",
  "cirru_edn",
diff --git a/Cargo.toml b/Cargo.toml
index 1f225176..f719c6bb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "calcit_runner"
-version = "0.4.15"
+version = "0.4.16"
 authors = ["jiyinyiyong <jiyinyiyong@gmail.com>"]
 edition = "2018"
 license = "MIT"
diff --git a/calcit/snapshots/test-record.cirru b/calcit/snapshots/test-record.cirru
index 23509db7..c0c7180a 100644
--- a/calcit/snapshots/test-record.cirru
+++ b/calcit/snapshots/test-record.cirru
@@ -131,7 +131,7 @@
                 .nth kitty 0
 
               &let
-                persian $ .extend kitty :Persian :age 10
+                persian $ .extend-as kitty :Persian :age 10
                 assert= 10 $ .get persian :age
                 assert= |Persian $ .get-name persian
 
diff --git a/package.json b/package.json
index b0c3f3ce..146db1f3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@calcit/procs",
-  "version": "0.4.15",
+  "version": "0.4.16",
   "main": "./lib/calcit.procs.js",
   "devDependencies": {
     "@types/node": "^16.4.13",
diff --git a/src/cirru/calcit-core.cirru b/src/cirru/calcit-core.cirru
index adc23b69..dd94e897 100644
--- a/src/cirru/calcit-core.cirru
+++ b/src/cirru/calcit-core.cirru
@@ -1310,7 +1310,7 @@
             :nth &record:nth
             :assoc &record:assoc
             :from-map &record:from-map
-            :extend &record:extend-as
+            :extend-as &record:extend-as
 
         |&core-list-class $ quote
           defrecord! &core-list-class
diff --git a/ts-src/calcit.procs.ts b/ts-src/calcit.procs.ts
index 971d3262..1e0af431 100644
--- a/ts-src/calcit.procs.ts
+++ b/ts-src/calcit.procs.ts
@@ -1,5 +1,5 @@
 // CALCIT VERSION
-export const calcit_version = "0.4.15";
+export const calcit_version = "0.4.16";
 
 import { overwriteComparator, initTernaryTreeMap } from "@calcit/ternary-tree";
 import { parse } from "@cirru/parser.ts";