diff --git a/webapp2.py b/webapp2.py
index e48e7bf..178c7d7 100755
--- a/webapp2.py
+++ b/webapp2.py
@@ -416,14 +416,12 @@ def write(self, text):
         """Appends a text to the response body."""
         # webapp uses StringIO as Response.out, so we need to convert anything
         # that is not str or unicode to string to keep same behavior.
-        if six.PY3 and isinstance(text, bytes):
-            text = text.decode(self.default_charset)
+        if not isinstance(text, bytes):
+            if not isinstance(text, six.string_types):
+                text = six.text_type(text)
 
-        if not isinstance(text, six.string_types):
-            text = six.text_type(text)
-
-        if isinstance(text, six.text_type) and not self.charset:
-            self.charset = self.default_charset
+            if isinstance(text, six.text_type) and not self.charset:
+                self.charset = self.default_charset
 
         super(Response, self).write(text)