diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index c64ac9e46ff..dfa96f6fa7f 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -2213,7 +2213,7 @@ HRESULT CDECL wined3d_device_set_light_enable(struct wined3d_device *device, UIN
     return WINED3D_OK;
 }
 
-HRESULT CDECL wined3d_device_get_light_enable(struct wined3d_device *device, UINT light_idx, BOOL *enable)
+HRESULT CDECL wined3d_device_get_light_enable(const struct wined3d_device *device, UINT light_idx, BOOL *enable)
 {
     UINT hash_idx = LIGHTMAP_HASHFUNC(light_idx);
     struct wined3d_light_info *light_info = NULL;
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index 7b9a576165e..e22feb52ef7 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2223,7 +2223,7 @@ HRESULT __cdecl wined3d_device_get_front_buffer_data(struct wined3d_device *devi
 void __cdecl wined3d_device_get_gamma_ramp(struct wined3d_device *device, UINT swapchain_idx, WINED3DGAMMARAMP *ramp);
 HRESULT __cdecl wined3d_device_get_index_buffer(struct wined3d_device *device, struct wined3d_buffer **index_buffer);
 HRESULT __cdecl wined3d_device_get_light(const struct wined3d_device *device, UINT light_idx, WINED3DLIGHT *light);
-HRESULT __cdecl wined3d_device_get_light_enable(struct wined3d_device *device, UINT light_idx, BOOL *enable);
+HRESULT __cdecl wined3d_device_get_light_enable(const struct wined3d_device *device, UINT light_idx, BOOL *enable);
 HRESULT __cdecl wined3d_device_get_material(struct wined3d_device *device, WINED3DMATERIAL *material);
 float __cdecl wined3d_device_get_npatch_mode(struct wined3d_device *device);
 HRESULT __cdecl wined3d_device_get_palette_entries(struct wined3d_device *device,