diff --git a/halfapi/lib/responses.py b/halfapi/lib/responses.py
index 0ed2f1f..7fb0acc 100644
--- a/halfapi/lib/responses.py
+++ b/halfapi/lib/responses.py
@@ -62,7 +62,7 @@ class ORJSONResponse(JSONResponse):
             decimal.Decimal
         }
         list_types = {
-            type(set)
+            set
         }
 
         if type(x) in str_types:
@@ -70,7 +70,7 @@ class ORJSONResponse(JSONResponse):
         if type(x) in list_types:
             return list(x)
 
-        raise TypeError(f'Type {type(x)} is not handled in ORJSONResponse')
+        raise TypeError(f'Type {type(x)} is not handled by ORJSONResponse')
 
 
 class HJSONResponse(ORJSONResponse):
diff --git a/tests/test_lib_responses.py b/tests/test_lib_responses.py
index c63fea8..3f66441 100644
--- a/tests/test_lib_responses.py
+++ b/tests/test_lib_responses.py
@@ -8,7 +8,7 @@ def test_orjson():
     test_obj = {
         "ok": "ko",
         "dec": decimal.Decimal(42),
-        "set": set([0,4,2])
+        "set": {0, 4, 2}
     }
 
     resp = ORJSONResponse(test_obj)
@@ -18,4 +18,4 @@ def test_orjson():
     assert 'ok' in test_obj_dec.keys()
     assert isinstance(test_obj_dec['ok'], str)
     assert isinstance(test_obj_dec['dec'], str)
-    assert isinstance(test_obj_dec['set'], liststr)
+    assert isinstance(test_obj_dec['set'], list)