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-rw-r--r--pkgs/build-support/docker/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index cfa8204f093..9369e7d3158 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -544,7 +544,7 @@ rec {
         passthru.layer = layer;
         passthru.imageTag =
           if tag != null
-            then lib.toLower tag
+            then tag
             else
               lib.head (lib.strings.splitString "-" (baseNameOf result.outPath));
         # Docker can't be made to run darwin binaries