diff --git a/ucl/inst.go b/ucl/inst.go
index f5cbc9f..8b896a7 100644
--- a/ucl/inst.go
+++ b/ucl/inst.go
@@ -56,7 +56,7 @@ func New(opts ...InstOption) *Inst {
 	rootEC.root = rootEC
 
 	rootEC.addCmd("echo", invokableFunc(echoBuiltin))
-	rootEC.addCmd("var", invokableFunc(setBuiltin))
+	rootEC.addCmd("set", invokableFunc(setBuiltin))
 	rootEC.addCmd("toUpper", invokableFunc(toUpperBuiltin))
 	rootEC.addCmd("len", invokableFunc(lenBuiltin))
 	rootEC.addCmd("index", invokableFunc(indexBuiltin))