diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 23165a4..9702971 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -5833,7 +5833,7 @@
     if( hostname_len + 1 == 0 )
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
 
-    if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME )
+    if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
 
     ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );