1 files changed, 2 insertions, 0 deletions
diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index d092efb556e5..2ec56c94763a 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -138,6 +138,7 @@ rec {
                 , sha1 ? null
                 , url ? null
                 , message ? null
+                , hashMode ? "flat"
                 } :
     assert (message != null) || (url != null);
     assert (sha256 != null) || (sha1 != null);
@@ -158,6 +159,7 @@ rec {
     in
     stdenv.mkDerivation {
       name = name_;
+      outputHashMode = hashMode;
       outputHashAlgo = hashAlgo;
       outputHash = hash;
       preferLocalBuild = true;