diff --git a/pkgs/development/python-modules/ipykernel/default.nix b/pkgs/development/python-modules/ipykernel/default.nix
index f4e7a1090745..5202483ab326 100644
--- a/pkgs/development/python-modules/ipykernel/default.nix
+++ b/pkgs/development/python-modules/ipykernel/default.nix
@@ -33,7 +33,7 @@ buildPythonPackage rec {
     })
   ];
 
-  checkInputs = [ pytestCheckHook nose ];
+  checkInputs = [ pytestCheckHook nose flaky ];
   dontUseSetuptoolsCheck = true;
   preCheck = ''
     export HOME=$(mktemp -d)