diff --git a/paddle/operators/math/im2col.cc b/paddle/operators/math/im2col.cc
index bcc18af0364978369f84ac9f80721f218f02e89d..a5fcf6da8cc7d336ea2bf961fc5329448b5d9b72 100644
--- a/paddle/operators/math/im2col.cc
+++ b/paddle/operators/math/im2col.cc
@@ -15,6 +15,7 @@ limitations under the License. */
 #include "paddle/operators/math/im2col.h"
 
 namespace paddle {
+namespace operators {
 namespace math {
 
 /*
@@ -243,4 +244,5 @@ template class Col2ImFunctor<kOCF, platform::CPUPlace, float>;
 template class Col2ImFunctor<kOCF, platform::CPUPlace, double>;
 
 }  // namespace math
+}  // namespace operators
 }  // namespace paddle
diff --git a/paddle/operators/math/im2col.cu b/paddle/operators/math/im2col.cu
index 2caa7c5ec268013f11561f2aa62a8e2bfe021590..23d3854610555dfff70a93759a85cf03c756795f 100644
--- a/paddle/operators/math/im2col.cu
+++ b/paddle/operators/math/im2col.cu
@@ -16,6 +16,7 @@ limitations under the License. */
 #include "paddle/platform/cuda_helper.h"
 
 namespace paddle {
+namespace operators {
 namespace math {
 
 template <class T>
@@ -353,4 +354,5 @@ template class Col2ImFunctor<kOCF, platform::GPUPlace, float>;
 template class Col2ImFunctor<kOCF, platform::GPUPlace, double>;
 
 }  // namespace math
+}  // namespace operators
 }  // namespace paddle
diff --git a/paddle/operators/math/im2col.h b/paddle/operators/math/im2col.h
index f6b428e2894bc83e0619b237a9cf7368f4588e09..1065cd3d85e73adff7fa6256e800f4b4089c4376 100644
--- a/paddle/operators/math/im2col.h
+++ b/paddle/operators/math/im2col.h
@@ -18,6 +18,7 @@ limitations under the License. */
 #include "paddle/platform/device_context.h"
 
 namespace paddle {
+namespace operators {
 namespace math {
 
 /* The storage format of the coldata in the Im2ColFunctor and Col2ImFunctor. */
@@ -85,4 +86,5 @@ class Col2ImFunctor {
 };
 
 }  // namespace math
+}  // namespace operators
 }  // namespace paddle