diff --git a/builtins.go b/builtins.go
index 4a9e72e..009756f 100644
--- a/builtins.go
+++ b/builtins.go
@@ -1581,7 +1581,7 @@ var funcBuiltins = buildBuiltinMap([]builtin{
 	&unaryBuiltin{name: "base64Decode", function: builtinBase64Decode, params: ast.Identifiers{"str"}},
 	&unaryBuiltin{name: "base64DecodeBytes", function: builtinBase64DecodeBytes, params: ast.Identifiers{"str"}},
 	&unaryBuiltin{name: "parseJson", function: builtinParseJSON, params: ast.Identifiers{"str"}},
-	&binaryBuiltin{name: "manifestJsonEx", function: builtinManifestJSONEx, params: ast.Identifiers{"x", "str"}},
+	&binaryBuiltin{name: "manifestJsonEx", function: builtinManifestJSONEx, params: ast.Identifiers{"value", "indent"}},
 	&unaryBuiltin{name: "base64", function: builtinBase64, params: ast.Identifiers{"input"}},
 	&unaryBuiltin{name: "encodeUTF8", function: builtinEncodeUTF8, params: ast.Identifiers{"str"}},
 	&unaryBuiltin{name: "decodeUTF8", function: builtinDecodeUTF8, params: ast.Identifiers{"arr"}},