diff --git a/lib/derivations.nix b/lib/derivations.nix
index 3a8c683da3c0..574b01695d86 100644
--- a/lib/derivations.nix
+++ b/lib/derivations.nix
@@ -216,8 +216,9 @@ in
   /**
     Wrap a derivation such that instantiating it produces a warning.
 
-    All attributes apart from `meta`, `name`, and `type` (which are used by
-    `nix search`) will be wrapped in `lib.warn`.
+    All attributes will be wrapped with `lib.warn` except from `.meta`, `.name`,
+    and `.type` which are used by `nix search`, and `.outputName` which avoids
+    double warnings with `nix-instantiate` and `nix-build`.
 
     # Inputs
 
@@ -246,6 +247,7 @@ in
         "meta"
         "name"
         "type"
+        "outputName"
       ];
     in
     drv // mapAttrs (_: lib.warn msg) drvToWrap;