diff --git a/examples/src/main/python/als.py b/examples/src/main/python/als.py
index 33700ab4f8c530952891f94c366a73726a77b1fb..01552dc1d449e8a6dac8a7b28d66ddcd0fc86184 100755
--- a/examples/src/main/python/als.py
+++ b/examples/src/main/python/als.py
@@ -38,7 +38,7 @@ def update(i, vec, mat, ratings):
     ff = mat.shape[1]
     
     XtX = mat.T * mat
-    XtY = mat.T * ratings[i, :].T
+    Xty = mat.T * ratings[i, :].T
     
     for j in range(ff):
         XtX[j,j] += LAMBDA * uu