diff --git a/rebar.config b/rebar.config
index fbcad39..c205046 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,5 +1,5 @@
 {erl_opts, [warnings_as_errors,
-	    {platform_define, "^2[0-3]{1}", fsm_deprecated},
+	    {platform_define, "^2[0-4]{1}", fsm_deprecated},
             {platform_define, "^1[7-8]{1}", old_rand},
             {platform_define, "^17", no_log2},
             {platform_define, "^R", no_sync},