diff --git a/Etaler/Backends/CPUBackend.hpp b/Etaler/Backends/CPUBackend.hpp
index 29671f3..42bf1a0 100644
--- a/Etaler/Backends/CPUBackend.hpp
+++ b/Etaler/Backends/CPUBackend.hpp
@@ -12,7 +12,7 @@
 namespace et
 {
 
-struct CPUBuffer : public BufferImpl
+struct ETALER_EXPORT CPUBuffer : public BufferImpl
 {
 	CPUBuffer(const Shape& shape, DType dtype, std::shared_ptr<Backend> backend)
 		: BufferImpl(shape.volume(), dtype, std::move(backend))
diff --git a/Etaler/Backends/OpenCLBackend.hpp b/Etaler/Backends/OpenCLBackend.hpp
index 3972025..a77367f 100644
--- a/Etaler/Backends/OpenCLBackend.hpp
+++ b/Etaler/Backends/OpenCLBackend.hpp
@@ -35,7 +35,7 @@ struct ETALER_EXPORT OpenCLBuffer : public BufferImpl
 	cl::Buffer buffer_;
 };
 
-struct KernelManager
+struct ETALER_EXPORT KernelManager
 {
 	KernelManager() : KernelManager(cl::Device(), cl::Context()) {};
 	KernelManager(cl::Device device, cl::Context context);
diff --git a/Etaler/Core/TensorImpl.hpp b/Etaler/Core/TensorImpl.hpp
index ecfda76..17ca036 100644
--- a/Etaler/Core/TensorImpl.hpp
+++ b/Etaler/Core/TensorImpl.hpp
@@ -12,7 +12,7 @@
 namespace et
 {
 
-struct BufferImpl : public std::enable_shared_from_this<BufferImpl>
+struct ETALER_EXPORT BufferImpl : public std::enable_shared_from_this<BufferImpl>
 {
 	BufferImpl(size_t size, DType dtype, std::shared_ptr<Backend> backend)
 		: size_(size), dtype_(dtype), backend_(backend) {}
@@ -26,7 +26,7 @@ struct BufferImpl : public std::enable_shared_from_this<BufferImpl>
 	std::shared_ptr<Backend> backend_;
 };
 
-struct TensorImpl : public std::enable_shared_from_this<TensorImpl>
+struct ETALER_EXPORT TensorImpl : public std::enable_shared_from_this<TensorImpl>
 {
 	TensorImpl(std::shared_ptr<BufferImpl> buffer, Shape shape, Shape stride, size_t offset=0)
 		: buffer_(buffer), shape_(shape), stride_(stride), offset_(offset) {}