diff --git a/src/ls_mysql.c b/src/ls_mysql.c
index ce9c0c9..c5311be 100644
--- a/src/ls_mysql.c
+++ b/src/ls_mysql.c
@@ -532,6 +532,7 @@ static int env_close (lua_State *L) {
 		lua_pushboolean (L, 0);
 		return 1;
 	}
+	mysql_library_end();
 	env->closed = 1;
 	lua_pushboolean (L, 1);
 	return 1;