diff --git a/pkgs/development/python-modules/trezor/default.nix b/pkgs/development/python-modules/trezor/default.nix
index c473403f53d..cb4b63ade81 100644
--- a/pkgs/development/python-modules/trezor/default.nix
+++ b/pkgs/development/python-modules/trezor/default.nix
@@ -12,9 +12,9 @@ buildPythonPackage rec {
     sha256 = "6bdb69fc125ba705854e21163be6c7da3aa17c2a3a84f40b6d8a3f6e4a8cb314";
   };
 
-  propagatedBuildInputs = [ protobuf hidapi requests ];
+  propagatedBuildInputs = [ protobuf hidapi requests mnemonic ];
 
-  buildInputs = [ ecdsa mnemonic ];
+  buildInputs = [ ecdsa ];
 
   # There are no actual tests: "ImportError: No module named tests"
   doCheck = false;