diff --git a/tests/keras/activations_test.py b/tests/keras/activations_test.py
index 4c0bb3683031..7b6396336dcd 100644
--- a/tests/keras/activations_test.py
+++ b/tests/keras/activations_test.py
@@ -118,7 +118,6 @@ def softplus(x):
     expected = softplus(test_values)
     assert_allclose(result, expected, rtol=1e-05)
 
-
 def test_softsign():
     """Test using a reference softsign implementation.
     """
@@ -153,6 +152,23 @@ def ref_sigmoid(x):
     expected = sigmoid(test_values)
     assert_allclose(result, expected, rtol=1e-05)
 
+def test_mish():
+    """Test mish implementation.
+    """
+    def ref_mish(x):
+        softplus = np.log(np.ones_like(x) + np.exp(x))
+        tanh_softplus_x = (np.exp(softplus) - np.exp(-softplus))/(np.exp(softplus) + np.exp(-softplus))
+        return x*tanh_softplus_x
+
+    mish = np.vectorize(ref_mish)
+
+    x = K.placeholder(ndim=2)
+    f = K.function([x], [activations.mish(x)])
+    test_values = get_standard_values()
+
+    result = f([test_values])[0]
+    expected = mish(test_values)
+    assert_allclose(result, expected, rtol=1e-05)
 
 def test_hard_sigmoid():
     """Test using a reference hard sigmoid implementation.