diff --git a/pkgs/development/python-modules/requests-http-signature/default.nix b/pkgs/development/python-modules/requests-http-signature/default.nix
index 225a8f149e4..f4b2efbc2ba 100644
--- a/pkgs/development/python-modules/requests-http-signature/default.nix
+++ b/pkgs/development/python-modules/requests-http-signature/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchFromGitHub
 , requests
+, cryptography
 , python
 }:
 
@@ -17,7 +18,7 @@ buildPythonPackage rec {
     sha256 = "0y96wsbci296m1rcxx0ybx8r44rdvyb59p1jl27p7rgz7isr3kx1";
   };
 
-  propagatedBuildInputs = [ requests ];
+  propagatedBuildInputs = [ requests cryptography ];
 
   checkPhase = ''
     ${python.interpreter} test/test.py