diff --git a/src/transifex_api/__init__.py b/src/transifex_api/__init__.py
index 8fd46e4..44ad17f 100644
--- a/src/transifex_api/__init__.py
+++ b/src/transifex_api/__init__.py
@@ -37,9 +37,11 @@ def purge(self):
         count = 0
         # Instead of filter, if Resource had a plural relationship to
         # ResourceString, we could do `self.fetch('resource_strings')`
-        for page in list(ResourceString.filter(resource=self).all_pages()):
+        for page in list(self.API.ResourceString.
+                         filter(resource=self).
+                         all_pages()):
             count += len(page)
-            ResourceString.bulk_delete(page)
+            self.API.ResourceString.bulk_delete(page)
         return count
 
 
@@ -173,5 +175,10 @@ def download(cls, interval=5, *args, **kwargs):
             download.reload()
 
 
+@TransifexApi.register
+class I18nFormat(jsonapi.Resource):
+    TYPE = "i18n_formats"
+
+
 # This is our global object
 transifex_api = TransifexApi()