diff --git a/debian/patches/Fix-cookie_decrypter.patch b/debian/patches/Fix-cookie_decrypter.patch
new file mode 100644
index 0000000..3ef9dbf
--- /dev/null
+++ b/debian/patches/Fix-cookie_decrypter.patch
@@ -0,0 +1,25 @@
+From: Sophie Brun <sophie@offensive-security.com>
+Date: Fri, 19 Nov 2021 11:50:29 +0100
+Subject: Fix cookie_decrypter
+
+
+Last-Update: 2021-11-23
+The script fails with "IndexError: list index out of range".
+The list index starts at 0, not 1.
+---
+ cookie_decrypter.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/cookie_decrypter.py b/cookie_decrypter.py
+index 7f59884..0dfca0b 100644
+--- a/cookie_decrypter.py
++++ b/cookie_decrypter.py
+@@ -6,7 +6,7 @@ from poshc2.server.database.DB import get_keys, database_connect
+ 
+ import sys, re
+ 
+-file = open(sys.argv[1], "r")
++file = open(sys.argv[0], "r")
+ database_connect()
+ result = get_keys()
+ 
diff --git a/debian/patches/series b/debian/patches/series
index 2626808..ec7ed5f 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -6,3 +6,4 @@
 rename-payload-templates.patch
 use-cryptodome.patch
 Indicate-that-sudo-is-required.patch
+Fix-cookie_decrypter.patch