diff --git a/streaming_form_data/targets.py b/streaming_form_data/targets.py
index 80cb44e7..35e66cab 100644
--- a/streaming_form_data/targets.py
+++ b/streaming_form_data/targets.py
@@ -107,9 +107,9 @@ def on_finish(self):
         value = b"".join(self._temp_value)
         self._temp_value = []
 
-        if self._type == str:
+        if self._type is str:
             value = value.decode("UTF-8")
-        elif self._type == bytes:
+        elif self._type is bytes:
             pass  # already is bytes, no need to do anything
         else:
             value = self._type(value)