diff --git a/dlls/wined3d/context.c b/dlls/wined3d/context.c
index 66460d97608..888c40c32cb 100644
--- a/dlls/wined3d/context.c
+++ b/dlls/wined3d/context.c
@@ -2100,7 +2100,7 @@ static DWORD context_generate_rt_mask_no_fbo(const struct wined3d_device *device
 }
 
 /* Context activation is done by the caller. */
-void context_apply_blit_state(struct wined3d_context *context, struct wined3d_device *device)
+void context_apply_blit_state(struct wined3d_context *context, const struct wined3d_device *device)
 {
     struct wined3d_surface *rt = context->current_rt;
     DWORD rt_mask, old_mask;
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 8278983a150..02c60e1b84a 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1233,7 +1233,7 @@ void context_alloc_event_query(struct wined3d_context *context,
         struct wined3d_event_query *query) DECLSPEC_HIDDEN;
 void context_alloc_occlusion_query(struct wined3d_context *context,
         struct wined3d_occlusion_query *query) DECLSPEC_HIDDEN;
-void context_apply_blit_state(struct wined3d_context *context, struct wined3d_device *device) DECLSPEC_HIDDEN;
+void context_apply_blit_state(struct wined3d_context *context, const struct wined3d_device *device) DECLSPEC_HIDDEN;
 BOOL context_apply_clear_state(struct wined3d_context *context, struct wined3d_device *device,
         UINT rt_count, const struct wined3d_fb_state *fb) DECLSPEC_HIDDEN;
 BOOL context_apply_draw_state(struct wined3d_context *context, struct wined3d_device *device) DECLSPEC_HIDDEN;