diff --git a/src/backend/backend.h b/src/backend/backend.h
index 556803c1..b14f5cfb 100644
--- a/src/backend/backend.h
+++ b/src/backend/backend.h
@@ -143,7 +143,7 @@ struct backend_operations {
 	/// remain valid.
 	///
 	/// Optional
-	void *(*root_change)(backend_t *backend_data, session_t *ps);
+	void (*root_change)(backend_t *backend_data, session_t *ps);
 
 	// ===========      Rendering      ============