diff --git a/cmd/playwasm/jsiter.go b/cmd/playwasm/jsiter.go
index e653f4b..c7fcead 100644
--- a/cmd/playwasm/jsiter.go
+++ b/cmd/playwasm/jsiter.go
@@ -10,6 +10,7 @@ import (
 	"syscall/js"
 	"ucl.lmika.dev/repl"
 	"ucl.lmika.dev/ucl"
+	"ucl.lmika.dev/ucl/builtins"
 )
 
 func invokeUCLCallback(name string, args ...any) {