diff --git a/python/paddle/v2/fluid/layers/math_op_patch.py b/python/paddle/v2/fluid/layers/math_op_patch.py
index 4cf995ec8552b3725986ba8e83168430b3154325..5301c3d1ded091a203b62e9e52dceca022e68683 100644
--- a/python/paddle/v2/fluid/layers/math_op_patch.py
+++ b/python/paddle/v2/fluid/layers/math_op_patch.py
@@ -154,7 +154,7 @@ def monkey_patch_variable():
         ("__rpow__", "elementwise_pow", True),
             # for logical compare
         ("__eq__", "equal", False),
-        ("__lt__", "less_then", False),
+        ("__lt__", "less_than", False),
         ("__le__", "less_equal", False), ):
         setattr(Variable, method_name,
                 _elemwise_method_creator_(method_name, op_type, reverse))