diff --git a/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt b/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt
index 383d8681b6e..1aeb89c9a60 100644
--- a/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt
@@ -1,7 +1,7 @@
 op {
   graph_op_name: "Cos"
   summary: "Computes cos of x element-wise."
-  description: << END
+  description: <<END
   Given an input tensor, this function computes cosine of every
   element in the tensor. Input range is `(-inf, inf)` and
   output range is `[-1,1]`. If input lies outside the boundary, `nan`
diff --git a/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt
index 2c695cde6b1..bcc9d73e41c 100644
--- a/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt
@@ -1,7 +1,7 @@
 op {
   graph_op_name: "Cosh"
   summary: "Computes hyperbolic cosine of x element-wise."
-  description: << END
+  description: <<END
   Given an input tensor, this function computes hyperbolic cosine of every
   element in the tensor. Input range is `[-inf, inf]` and output range
   is `[1, inf]`.
diff --git a/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt b/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt
index 5cc1d7c9be4..c052b451f9f 100644
--- a/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt
@@ -1,7 +1,7 @@
 op {
   graph_op_name: "Sin"
   summary: "Computes sine of x element-wise."
-  description: << END
+  description: <<END
   Given an input tensor, this function computes sine of every
   element in the tensor. Input range is `(-inf, inf)` and
   output range is `[-1,1]`.
diff --git a/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt
index 70e0f1bedd6..de3a1c1b3a0 100644
--- a/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt
@@ -1,7 +1,7 @@
 op {
   graph_op_name: "Sinh"
   summary: "Computes hyperbolic sine of x element-wise."
-  description: << END
+  description: <<END
   Given an input tensor, this function computes hyperbolic sine of every
   element in the tensor. Input range is `[-inf,inf]` and output range
   is `[-inf,inf]`.
diff --git a/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt b/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt
index 8a972ba3d86..83098ae0663 100644
--- a/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt
@@ -1,7 +1,7 @@
 op {
   graph_op_name: "Tan"
   summary: "Computes tan of x element-wise."
-  description: << END
+  description: <<END
   Given an input tensor, this function computes tangent of every
   element in the tensor. Input range is `(-inf, inf)` and
   output range is `(-inf, inf)`. If input lies outside the boundary, `nan`
diff --git a/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt
index e33fbff6c3e..362c88116ca 100644
--- a/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt
@@ -1,7 +1,7 @@
 op {
   graph_op_name: "Tanh"
   summary: "Computes hyperbolic tangent of `x` element-wise."
-  description: << END
+  description: <<END
   Given an input tensor, this function computes hyperbolic tangent of every
   element in the tensor. Input range is `[-inf, inf]` and
   output range is `[-1,1]`.