diff --git a/php_memcached.c b/php_memcached.c
index c1bce93b..b6610568 100644
--- a/php_memcached.c
+++ b/php_memcached.c
@@ -4390,7 +4390,6 @@ static void php_memc_register_constants(INIT_FUNC_ARGS)
 	REGISTER_MEMC_CLASS_CONST_LONG(RES_MEMORY_ALLOCATION_FAILURE, MEMCACHED_MEMORY_ALLOCATION_FAILURE);
 	REGISTER_MEMC_CLASS_CONST_LONG(RES_CONNECTION_SOCKET_CREATE_FAILURE, MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE);
 
-	REGISTER_MEMC_CLASS_CONST_LONG(RES_BAD_KEY_PROVIDED,                 MEMCACHED_BAD_KEY_PROVIDED);
 	REGISTER_MEMC_CLASS_CONST_LONG(RES_E2BIG,                            MEMCACHED_E2BIG);
 	REGISTER_MEMC_CLASS_CONST_LONG(RES_KEY_TOO_BIG,                      MEMCACHED_KEY_TOO_BIG);
 	REGISTER_MEMC_CLASS_CONST_LONG(RES_SERVER_TEMPORARILY_DISABLED,      MEMCACHED_SERVER_TEMPORARILY_DISABLED);