1 files changed, 1 insertions, 1 deletions
diff --git a/bottle.py b/bottle.py
index b8a79f1..fe32e63 100755
--- a/bottle.py
+++ b/bottle.py
@@ -1594,7 +1594,7 @@ class BaseRequest(object):
     def __setattr__(self, name, value):
         if name == 'environ': return object.__setattr__(self, name, value)
         key = 'bottle.request.ext.%s' % name
-        if key in self.environ:
+        if hasattr(self, name):
             raise AttributeError("Attribute already defined: %s" % name)
         self.environ[key] = value