diff --git a/ivatar/utils.py b/ivatar/utils.py
index ccd9771..3e50824 100644
--- a/ivatar/utils.py
+++ b/ivatar/utils.py
@@ -217,33 +217,33 @@ def is_trusted_url(url, url_filters):
     """
     (scheme, netloc, path, params, query, fragment) = urlparse(url)
 
-    for filter in url_filters:
-        if "schemes" in filter:
-            schemes = filter["schemes"]
+    for ufilter in url_filters:
+        if "schemes" in ufilter:
+            schemes = ufilter["schemes"]
 
             if scheme not in schemes:
                 continue
 
-        if "host_equals" in filter:
-            host_equals = filter["host_equals"]
+        if "host_equals" in ufilter:
+            host_equals = ufilter["host_equals"]
 
             if netloc != host_equals:
                 continue
 
-        if "host_suffix" in filter:
-            host_suffix = filter["host_suffix"]
+        if "host_suffix" in ufilter:
+            host_suffix = ufilter["host_suffix"]
 
             if not netloc.endswith(host_suffix):
                 continue
 
-        if "path_prefix" in filter:
-            path_prefix = filter["path_prefix"]
+        if "path_prefix" in ufilter:
+            path_prefix = ufilter["path_prefix"]
 
             if not path.startswith(path_prefix):
                 continue
 
-        if "url_prefix" in filter:
-            url_prefix = filter["url_prefix"]
+        if "url_prefix" in ufilter:
+            url_prefix = ufilter["url_prefix"]
 
             if not url.startswith(url_prefix):
                 continue