diff --git a/pkgs/by-name/ba/backblaze-b2/package.nix b/pkgs/by-name/ba/backblaze-b2/package.nix
index c4ee5eb0aff2..4fc25ff8421c 100644
--- a/pkgs/by-name/ba/backblaze-b2/package.nix
+++ b/pkgs/by-name/ba/backblaze-b2/package.nix
@@ -52,6 +52,7 @@ python3Packages.buildPythonApplication rec {
     pexpect
     pytestCheckHook
     pytest-xdist
+    tenacity
   ];
 
   preCheck = ''