diff --git a/drivers/gpu/drm/armada/armada_output.h b/drivers/gpu/drm/armada/armada_output.h
index 4126d43b5057a0a8b7d17a9eeb97f46b820bc63e..3c4023e142d06fab06665d07b691b50db91a1cd0 100644
--- a/drivers/gpu/drm/armada/armada_output.h
+++ b/drivers/gpu/drm/armada/armada_output.h
@@ -9,7 +9,7 @@
 #define ARMADA_CONNETOR_H
 
 #define encoder_helper_funcs(encoder) \
-	((struct drm_encoder_helper_funcs *)encoder->helper_private)
+	((const struct drm_encoder_helper_funcs *)encoder->helper_private)
 
 struct armada_output_type {
 	int connector_type;