diff --git a/flake.nix b/flake.nix
index 96d0625..af249bd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -42,6 +42,8 @@
             gmp
           ];
 
+          checkInputs = [pythonEnv];
+
           # Use x86-64-v3 (AVX2) for a portable binary; override with ARCH=native for local builds
           ARCH = "x86-64-v3";