diff --git a/python/paddle/trainer_config_helpers/activations.py b/python/paddle/trainer_config_helpers/activations.py
index 6261934e1bc8e8df62aeaa0757f4a237f91ef748..eeed18a98a27313dac65a695960043d0543bb577 100644
--- a/python/paddle/trainer_config_helpers/activations.py
+++ b/python/paddle/trainer_config_helpers/activations.py
@@ -16,7 +16,8 @@ __all__ = [
     "TanhActivation", "SigmoidActivation", "SoftmaxActivation",
     "IdentityActivation", "LinearActivation", 'SequenceSoftmaxActivation',
     'ExpActivation', "ReluActivation", "BReluActivation", "SoftReluActivation",
-    "STanhActivation", "AbsActivation", "SquareActivation", "BaseActivation"
+    "STanhActivation", "AbsActivation", "SquareActivation", "BaseActivation",
+    "LogActivation"
 ]