diff --git a/pkgs/by-name/co/conduit/package.nix b/pkgs/by-name/co/conduit/package.nix
index 499802a528a2..e5172dd05976 100644
--- a/pkgs/by-name/co/conduit/package.nix
+++ b/pkgs/by-name/co/conduit/package.nix
@@ -36,6 +36,8 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   cmakeFlags = [
+    # Don't leak kernel version into the build output for reproducibility
+    "-DCMAKE_SYSTEM_VERSION="
     (lib.cmakeBool "ENABLE_MPI" mpiSupport)
   ];