diff --git a/lib/objagg.c b/lib/objagg.c
index 55621fb..5e1676c 100644
--- a/lib/objagg.c
+++ b/lib/objagg.c
@@ -28,7 +28,7 @@
 	struct objagg_hints_node *parent;
 	unsigned int root_id;
 	struct objagg_obj_stats_info stats_info;
-	unsigned long obj[0];
+	unsigned long obj[];
 };
 
 static struct objagg_hints_node *
@@ -66,7 +66,7 @@
 				* including nested objects
 				*/
 	struct objagg_obj_stats stats;
-	unsigned long obj[0];
+	unsigned long obj[];
 };
 
 static unsigned int objagg_obj_ref_inc(struct objagg_obj *objagg_obj)