diff --git a/keras/constraints.py b/keras/constraints.py
index 13df3217a..a1164126f 100644
--- a/keras/constraints.py
+++ b/keras/constraints.py
@@ -24,7 +24,7 @@ class NonNeg(Constraint):
 
 class UnitNorm(Constraint):
     def __call__(self, p):
-        return e / T.sqrt(T.sum(e**2, axis=-1, keepdims=True))
+        return p / T.sqrt(T.sum(p**2, axis=-1, keepdims=True))
 
 identity = Constraint
 maxnorm = MaxNorm
diff --git a/tests/auto/test_embeddings.py b/tests/auto/test_embeddings.py
index 7b8308eeb..f4c22e8ba 100644
--- a/tests/auto/test_embeddings.py
+++ b/tests/auto/test_embeddings.py
@@ -14,7 +14,7 @@ class TestConcatenation(unittest.TestCase):
 
     def test_unitnorm_constraint(self):
         lookup = Sequential()
-        lookup.add(Embedding(3, 2, weights=[self.W1], W_constraint=unitnorm))
+        lookup.add(Embedding(3, 2, weights=[self.W1], W_constraint=unitnorm()))
         lookup.add(Flatten())
         lookup.add(Dense(2, 1))
         lookup.add(Activation('sigmoid'))