diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
index 105ecdb68a..00ba3a3cb4 100644
--- a/lib/librte_hash/rte_cuckoo_hash.c
+++ b/lib/librte_hash/rte_cuckoo_hash.c
@@ -142,7 +142,7 @@ struct rte_hash_key {
 		void *pdata;
 	};
 	/* Variable key size */
-	char key[];
+	char key[0];
 } __attribute__((aligned(KEY_ALIGNMENT)));
 
 /** Bucket structure */