diff --git a/include/nuttx/net/netfilter/ip_tables.h b/include/nuttx/net/netfilter/ip_tables.h
index 0ac092fce01..0828e36e680 100644
--- a/include/nuttx/net/netfilter/ip_tables.h
+++ b/include/nuttx/net/netfilter/ip_tables.h
@@ -117,7 +117,7 @@ struct ipt_entry
 
   struct xt_counters counters; /* Packet and byte counters. */
 
-  unsigned char elems[0];      /* The matches (if any), then the target. */
+  unsigned char elems[1];      /* The matches (if any), then the target. */
 };
 
 /* Note 1: How entries are organized in following interface arguments.
diff --git a/include/nuttx/net/netfilter/x_tables.h b/include/nuttx/net/netfilter/x_tables.h
index 721dcaa24a8..d180c18ea80 100644
--- a/include/nuttx/net/netfilter/x_tables.h
+++ b/include/nuttx/net/netfilter/x_tables.h
@@ -62,7 +62,7 @@ struct xt_entry_target
       uint16_t target_size; /* Total length */
     } u;
 
-  unsigned char data[0];
+  unsigned char data[1];
 };
 
 struct xt_standard_target