diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index 1b722f54ab0..ac609fdd62f 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -2595,7 +2595,7 @@ HRESULT CDECL wined3d_device_set_scissor_rect(struct wined3d_device *device, con
     return WINED3D_OK;
 }
 
-HRESULT CDECL wined3d_device_get_scissor_rect(struct wined3d_device *device, RECT *rect)
+HRESULT CDECL wined3d_device_get_scissor_rect(const struct wined3d_device *device, RECT *rect)
 {
     TRACE("device %p, rect %p.\n", device, rect);
 
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index ddf65618559..b05acae2082 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2245,7 +2245,7 @@ HRESULT __cdecl wined3d_device_get_render_target(struct wined3d_device *device,
         UINT render_target_idx, struct wined3d_surface **render_target);
 HRESULT __cdecl wined3d_device_get_sampler_state(const struct wined3d_device *device,
         UINT sampler_idx, WINED3DSAMPLERSTATETYPE state, DWORD *value);
-HRESULT __cdecl wined3d_device_get_scissor_rect(struct wined3d_device *device, RECT *rect);
+HRESULT __cdecl wined3d_device_get_scissor_rect(const struct wined3d_device *device, RECT *rect);
 BOOL __cdecl wined3d_device_get_software_vertex_processing(struct wined3d_device *device);
 HRESULT __cdecl wined3d_device_get_stream_source(const struct wined3d_device *device,
         UINT stream_idx, struct wined3d_buffer **buffer, UINT *offset, UINT *stride);