1 files changed, 1 insertions, 1 deletions

diff --git a/include/drm/drm_encoder_slave.h b/include/drm/drm_encoder_slave.h
index 2f65633d28a7..7dc385233805 100644
--- a/include/drm/drm_encoder_slave.h
+++ b/include/drm/drm_encoder_slave.h
@@ -54,7 +54,7 @@ struct drm_encoder_slave_funcs {
         void (*save)(struct drm_encoder *encoder);
         void (*restore)(struct drm_encoder *encoder);
         bool (*mode_fixup)(struct drm_encoder *encoder,
-                           struct drm_display_mode *mode,
+                           const struct drm_display_mode *mode,
                            struct drm_display_mode *adjusted_mode);
         int (*mode_valid)(struct drm_encoder *encoder,
                           struct drm_display_mode *mode);