diff --git a/rebar.config b/rebar.config
index 22c66beae..d25c31ca2 100644
--- a/rebar.config
+++ b/rebar.config
@@ -114,6 +114,7 @@
             {if_version_below, "23", {d, 'USE_OLD_PG2'}},
             {if_version_below, "24", {d, 'COMPILER_REPORTS_ONLY_LINES'}},
             {if_version_below, "24", {d, 'SYSTOOLS_APP_DEF_WITHOUT_OPTIONAL'}},
+            {if_version_below, "25", {d, 'OTP_BELOW_25'}},
             {if_var_false, debug, no_debug_info},
             {if_var_true, debug, debug_info},
             {if_var_true, elixir, {d, 'ELIXIR_ENABLED'}},