diff --git a/src/libsysprof-ui/sysprof-visualizer-view.h b/src/libsysprof-ui/sysprof-visualizer-view.h
index a91d8e14..f2419182 100644
--- a/src/libsysprof-ui/sysprof-visualizer-view.h
+++ b/src/libsysprof-ui/sysprof-visualizer-view.h
@@ -48,22 +48,8 @@ struct _SysprofVisualizerViewClass
   void (*visualizer_removed) (SysprofVisualizerView *self,
                               SysprofVisualizerRow  *visualizer);
 
-  gpointer _reserved1;
-  gpointer _reserved2;
-  gpointer _reserved3;
-  gpointer _reserved4;
-  gpointer _reserved5;
-  gpointer _reserved6;
-  gpointer _reserved7;
-  gpointer _reserved8;
-  gpointer _reserved9;
-  gpointer _reserved10;
-  gpointer _reserved11;
-  gpointer _reserved12;
-  gpointer _reserved13;
-  gpointer _reserved14;
-  gpointer _reserved15;
-  gpointer _reserved16;
+  /*< private >*/
+  gpointer _reserved[16];
 };
 
 SYSPROF_AVAILABLE_IN_ALL