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-rw-r--r--pkgs/lib/types.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/lib/types.nix b/pkgs/lib/types.nix
index fd3c071c0be..2416fbe30a3 100644
--- a/pkgs/lib/types.nix
+++ b/pkgs/lib/types.nix
@@ -101,7 +101,7 @@ rec {
     };
 
     attrsOf = elemType: mkOptionType {
-      name = "attribute set of ${elemType}s";
+      name = "attribute set of ${elemType.name}s";
       check = x: lib.traceValIfNot builtins.isAttrs x
         && fold (e: v: v && elemType.check e) true (lib.attrValues x);
       merge = lib.zip (name: elemType.merge);