diff --git a/sklearn/decomposition/pca.py b/sklearn/decomposition/pca.py
index c56fdd6bbb6..bf4e7e43e68 100644
--- a/sklearn/decomposition/pca.py
+++ b/sklearn/decomposition/pca.py
@@ -320,7 +320,7 @@ class ProbabilisticPCA(PCA):
             self.covariance_ += self.explained_variance_[k] * add_cov
         return self
 
-    def score(self, X):
+    def score(self, X, y=None):
         """Return a score associated to new data
 
         Parameters