diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 4e4c0f9..baf2301 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -619,7 +619,8 @@
 
     if ( ssl->rsa_key )
     {
-        ret = rsa_pkcs1_sign( ssl->rsa_key, RSA_PRIVATE,
+        ret = rsa_pkcs1_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng,
+                              RSA_PRIVATE,
                               SIG_RSA_RAW, 36, hash, ssl->out_msg + 6 + n );
     }
 #if defined(POLARSSL_PKCS11_C)