diff --git a/tests/python_tests/json_feature_properties_test.py b/tests/python_tests/json_feature_properties_test.py
index 25c6a8c41..82e909e5b 100644
--- a/tests/python_tests/json_feature_properties_test.py
+++ b/tests/python_tests/json_feature_properties_test.py
@@ -94,7 +94,7 @@ def test_char_escaping():
         # confirm our behavior is the same as python json module
         # for the original string
         geojson_feat_string = feat.to_geojson()
-        eq_(geojson_feat_string,char['json'],"Mapnik's json escaping is not to spec: actual(%s) and expected(%s)" % (geojson_feat_string,char['json']))
+        eq_(geojson_feat_string,char['json'],"Mapnik's json escaping is not to spec: actual(%s) and expected(%s) for %s" % (geojson_feat_string,char['json'],char['name']))
         # and the round tripped string
         pyjson = json.loads(geojson_feat_string)
         eq_(pyjson['properties']['name'],expected)