diff --git a/overlay.nix b/overlay.nix
index e342da7..25edd66 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -9,7 +9,11 @@ let
   mkDeps = name: pkgs: final.runCommand name { }
     "printf '%s\n' ${toString (collect (x: x ? outPath) pkgs)} > $out";
 
-  bscPkgs = {
+  mkStrict = drv: if (isDerivation drv && drv ? overrideAttrs && !(drv ? strictDeps))
+    then drv.overrideAttrs { strictDeps = true; }
+    else drv;
+
+  bscPkgs = mapAttrs (_: mkStrict) {
     bench6 = callPackage ./pkgs/bench6/default.nix { };
     bigotes = callPackage ./pkgs/bigotes/default.nix { };
     clangOmpss2 = callPackage ./pkgs/llvm-ompss2/default.nix { };