--- a/tests/suite/std_param_names.jsonnet
+++ b/tests/suite/std_param_names.jsonnet
@@ -70,7 +70,7 @@
     manifestXmlJsonml: ['value'],
     base64: ['input'],
     base64DecodeBytes: ['str'],
-    base64Decode: ['str'],
+    base64Decode: ['str', 'lossy'],
     reverse: ['arr'],
     sort: ['arr', 'keyF'],
     uniq: ['arr', 'keyF'],