diff --git a/package/rdesktop/0002-use-correct-modulus-and-exponent.patch b/package/rdesktop/0002-use-correct-modulus-and-exponent.patch
new file mode 100644
index 0000000000..f6989d5777
--- /dev/null
+++ b/package/rdesktop/0002-use-correct-modulus-and-exponent.patch
@@ -0,0 +1,29 @@
+From 53ba87dc174175e98332e22355ad8662c02880d6 Mon Sep 17 00:00:00 2001
+From: Markus Beth <markus.beth@zkrd.de>
+Date: Mon, 2 Dec 2019 11:22:13 +0100
+Subject: [PATCH] use correct modulus and exponent in rdssl_rkey_get_exp_mod
+
+Upstream: https://github.com/rdesktop/rdesktop/commit/53ba87dc174175e98332e22355ad8662c02880d6
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ ssl.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/ssl.c b/ssl.c
+index 930c7f94..0681a890 100644
+--- a/ssl.c
++++ b/ssl.c
+@@ -307,10 +307,10 @@ rdssl_rkey_get_exp_mod(RDSSL_RKEY * rkey, uint8 * exponent, uint32 max_exp_len,
+ {
+ 	size_t outlen;
+ 
+-	outlen = (mpz_sizeinbase(modulus, 2) + 7) / 8;
++	outlen = (mpz_sizeinbase(rkey->n, 2) + 7) / 8;
+ 	if (outlen > max_mod_len)
+ 		return 1;
+-	outlen = (mpz_sizeinbase(exponent, 2) + 7) / 8;
++	outlen = (mpz_sizeinbase(rkey->e, 2) + 7) / 8;
+ 	if (outlen > max_exp_len)
+ 		return 1;
+