diff --git a/wa/utils/serializer.py b/wa/utils/serializer.py
index b9147004..47b78340 100644
--- a/wa/utils/serializer.py
+++ b/wa/utils/serializer.py
@@ -72,7 +72,7 @@ POD_TYPES = [
     tuple,
     dict,
     set,
-    str,
+    basestring,
     str,
     int,
     float,