diff --git a/src/muda/buffer/details/graph_buffer_2d_view.inl b/src/muda/buffer/details/graph_buffer_2d_view.inl
index 17b40d59..e5268b69 100644
--- a/src/muda/buffer/details/graph_buffer_2d_view.inl
+++ b/src/muda/buffer/details/graph_buffer_2d_view.inl
@@ -7,7 +7,7 @@ MUDA_INLINE void ComputeGraphVar<Buffer2DView<T>>::update(const RWView& view)
     m_value = view;
 }
 template <typename T>
-MUDA_INLINE ComputeGraphVar<Buffer2DView<T>>& ComputeGraphVar<Buffer2DView<T>>::operator=(const RWView& view)
+MUDA_INLINE auto ComputeGraphVar<Buffer2DView<T>>::operator=(const RWView& view) -> ComputeGraphVar<VarType>&
 {
     update(view);
     return *this;
diff --git a/src/muda/buffer/details/graph_buffer_3d_view.inl b/src/muda/buffer/details/graph_buffer_3d_view.inl
index c466e138..eef136fa 100644
--- a/src/muda/buffer/details/graph_buffer_3d_view.inl
+++ b/src/muda/buffer/details/graph_buffer_3d_view.inl
@@ -7,7 +7,7 @@ MUDA_INLINE void ComputeGraphVar<Buffer3DView<T>>::update(const RWView& view)
     m_value = view;
 }
 template <typename T>
-MUDA_INLINE ComputeGraphVar<Buffer3DView<T>>& ComputeGraphVar<Buffer3DView<T>>::operator=(const RWView& view)
+MUDA_INLINE auto ComputeGraphVar<Buffer3DView<T>>::operator=(const RWView& view) -> ComputeGraphVar<VarType>&
 {
     update(view);
     return *this;
diff --git a/src/muda/buffer/details/graph_buffer_view.inl b/src/muda/buffer/details/graph_buffer_view.inl
index 00084c9b..f83f7a56 100644
--- a/src/muda/buffer/details/graph_buffer_view.inl
+++ b/src/muda/buffer/details/graph_buffer_view.inl
@@ -7,7 +7,7 @@ MUDA_INLINE void ComputeGraphVar<BufferView<T>>::update(const RWView& view)
     m_value = view;
 }
 template <typename T>
-MUDA_INLINE ComputeGraphVar<BufferView<T>>& ComputeGraphVar<BufferView<T>>::operator=(const RWView& view)
+MUDA_INLINE auto ComputeGraphVar<BufferView<T>>::operator=(const RWView& view) -> ComputeGraphVar<VarType>&
 {
     update(view);
     return *this;
diff --git a/src/muda/buffer/details/graph_var_view.inl b/src/muda/buffer/details/graph_var_view.inl
index a9c79c6e..b46824e0 100644
--- a/src/muda/buffer/details/graph_var_view.inl
+++ b/src/muda/buffer/details/graph_var_view.inl
@@ -7,7 +7,7 @@ MUDA_INLINE void ComputeGraphVar<VarView<T>>::update(const RWView& view)
     m_value = view;
 }
 template <typename T>
-MUDA_INLINE ComputeGraphVar<VarView<T>>& ComputeGraphVar<VarView<T>>::operator=(const RWView& view)
+MUDA_INLINE auto ComputeGraphVar<VarView<T>>::operator=(const RWView& view) -> ComputeGraphVar<VarType>&
 {
     update(view);
     return *this;