diff --git a/pkgs/development/python-modules/python-olm/default.nix b/pkgs/development/python-modules/python-olm/default.nix
index 2a8295a65bf7..d38c33df8c81 100644
--- a/pkgs/development/python-modules/python-olm/default.nix
+++ b/pkgs/development/python-modules/python-olm/default.nix
@@ -17,6 +17,10 @@ buildPythonPackage {
     future
   ] ++ lib.optionals (!isPy3k) [ typing ];
 
+  propagatedNativeBuildInputs = [
+    cffi
+  ];
+
   # Some required libraries for testing are not packaged yet.
   doCheck = false;
   pythonImportsCheck = [ "olm" ];