diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index 26b4d27c78..cfd8cedcec 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -5823,7 +5823,7 @@ HRESULT CDECL wined3d_device_get_creation_parameters(const struct wined3d_device
     return WINED3D_OK;
 }
 
-void CDECL wined3d_device_set_gamma_ramp(struct wined3d_device *device,
+void CDECL wined3d_device_set_gamma_ramp(const struct wined3d_device *device,
         UINT swapchain_idx, DWORD flags, const WINED3DGAMMARAMP *ramp)
 {
     struct wined3d_swapchain *swapchain;
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index a94f5d0f5e..f16530ceb5 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2295,7 +2295,7 @@ HRESULT __cdecl wined3d_device_set_depth_stencil(struct wined3d_device *device,
 HRESULT __cdecl wined3d_device_set_dialog_box_mode(struct wined3d_device *device, BOOL enable_dialogs);
 HRESULT __cdecl wined3d_device_set_display_mode(struct wined3d_device *device,
         UINT swapchain_idx, const WINED3DDISPLAYMODE *mode);
-void __cdecl wined3d_device_set_gamma_ramp(struct wined3d_device *device,
+void __cdecl wined3d_device_set_gamma_ramp(const struct wined3d_device *device,
         UINT swapchain_idx, DWORD flags, const WINED3DGAMMARAMP *ramp);
 HRESULT __cdecl wined3d_device_set_index_buffer(struct wined3d_device *device,
         struct wined3d_buffer *index_buffer, enum wined3d_format_id format_id);