diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 6f73a31..6f28c4f 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -2993,7 +2993,7 @@
 		/* Clear openssl global errors stack */
 		ERR_clear_error();
 
-		if (global_ssl.default_dh_param <= 1024) {
+		if (global_ssl.default_dh_param && global_ssl.default_dh_param <= 1024) {
 			/* we are limited to DH parameter of 1024 bits anyway */
 			if (local_dh_1024 == NULL)
 				local_dh_1024 = ssl_get_dh_1024();