diff --git a/artiq-fast/pkgs/python-deps.nix b/artiq-fast/pkgs/python-deps.nix
index c556764..c0d511b 100644
--- a/artiq-fast/pkgs/python-deps.nix
+++ b/artiq-fast/pkgs/python-deps.nix
@@ -256,7 +256,7 @@ rec {
     '';
 
 
-    checkInputs = [ python3Packages.pytest python3Packages.pytest-flake8 ];
+    checkInputs = [ python3Packages.pytest python3Packages.pytest-timeout python3Packages.pytest-flake8 ];
     checkPhase = "pytest";
 
     preBuild = ''