diff --git a/src/cfg.c b/src/cfg.c
index 36582f7..1b17509 100644
--- a/src/cfg.c
+++ b/src/cfg.c
@@ -152,7 +152,7 @@
       { "TLSv1", TLS1_VERSION },
       { "TLSv1.1", TLS1_1_VERSION },
       { "TLSv1.2", TLS1_2_VERSION },
-   #if OPENSSL_VERSION_NUMBER >= 0x10100000L
+   #ifdef TLS1_3_VERSION
       { "TLSv1.3", TLS1_3_VERSION },
    #endif
    };