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-rw-r--r--lib/customisation.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/customisation.nix b/lib/customisation.nix
index fb78335ea1c..3988f4e9b69 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -157,8 +157,9 @@ rec {
 
   /* Add attributes to each output of a derivation without changing
      the derivation itself. */
-  addPassthru = lib.warn "`addPassthru` is deprecated, replace with `extendDerivation true`"
-                         (extendDerivation true);
+  addPassthru =
+    lib.warn "`addPassthru drv passthru` is deprecated, replace with `extendDerivation true passthru drv`"
+      (drv: passthru: extendDerivation true passthru drv);
 
   /* Strip a derivation of all non-essential attributes, returning
      only those needed by hydra-eval-jobs. Also strictly evaluate the