diff --git a/lib/puppet/resource.rb b/lib/puppet/resource.rb
index 9a84425bd4e..2ed39255d22 100644
--- a/lib/puppet/resource.rb
+++ b/lib/puppet/resource.rb
@@ -122,7 +122,7 @@ def is_json_type?(value)
     when Array
       value.all? { |elem| is_json_type?(elem) }
     when Hash
-      value.all? { |key, val| key.is_a?(String) && is_json_type(val) }
+      value.all? { |key, val| key.is_a?(String) && is_json_type?(val) }
     else
       false
     end