diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 0a69f4d..cd0d8c2 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -651,9 +651,12 @@
     SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
                    ext_len ) );
 
-    *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( ext_len      ) & 0xFF );
-    p += ext_len;
+    if( ext_len > 0 )
+    {
+        *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
+        *p++ = (unsigned char)( ( ext_len      ) & 0xFF );
+        p += ext_len;
+    }
 
     ssl->out_msglen  = p - buf;
     ssl->out_msgtype = SSL_MSG_HANDSHAKE;