diff --git a/scikits/learn/feature_extraction/text/dense.py b/scikits/learn/feature_extraction/text/dense.py
index 379f1c92c75bbc81e84f86d0f73f3a41a50ef6d3..181627efc44ff551bab46ef47773d7faaea8418d 100644
--- a/scikits/learn/feature_extraction/text/dense.py
+++ b/scikits/learn/feature_extraction/text/dense.py
@@ -228,7 +228,7 @@ class BaseCountVectorizer(BaseEstimator):
         Type of the matrix returned by fit_transform() or transform().
     """
 
-    def __init__(self, analyzer=DEFAULT_ANALYZER, vocabulary={}, max_df=0.5,
+    def __init__(self, analyzer=DEFAULT_ANALYZER, vocabulary={}, max_df=1.0,
                  max_features=None, dtype=long):
         self.analyzer = analyzer
         self.vocabulary = vocabulary