diff --git a/pkgs/development/interpreters/python/cpython/default.nix b/pkgs/development/interpreters/python/cpython/default.nix
index cb273155a58f..8e340dd3b146 100644
--- a/pkgs/development/interpreters/python/cpython/default.nix
+++ b/pkgs/development/interpreters/python/cpython/default.nix
@@ -101,6 +101,8 @@ let
 
   version = with sourceVersion; "${major}.${minor}.${patch}${suffix}";
 
+  strictDeps = true;
+
   nativeBuildInputs = optionals (!stdenv.isDarwin) [
     autoreconfHook
   ] ++ optionals (!stdenv.isDarwin && passthru.pythonAtLeast "3.10") [