diff --git a/paddle/fluid/operators/activation_op.cc b/paddle/fluid/operators/activation_op.cc
index 5065244c44afe304665b390f2ee888f3951e800c..92fbbc2854eda889b3198ec0afe7f05d10b7cda3 100644
--- a/paddle/fluid/operators/activation_op.cc
+++ b/paddle/fluid/operators/activation_op.cc
@@ -196,7 +196,7 @@ $out = [x]$
 __attribute__((unused)) constexpr char ReciprocalDoc[] = R"DOC(
 Reciprocal Activation Operator.
 
-$$out = \frac{1}{x}$$
+$$out = \\frac{1}{x}$$
 
 )DOC";