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-rw-r--r--lib/attrsets.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/attrsets.nix b/lib/attrsets.nix
index 19218cfe8ec..dca39cf79ff 100644
--- a/lib/attrsets.nix
+++ b/lib/attrsets.nix
@@ -195,8 +195,9 @@ rec {
           { x = "foo"; y = "bar"; }
        => { x = "x-foo"; y = "y-bar"; }
   */
-  mapAttrs = f: set:
-    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set));
+  mapAttrs = builtins.mapAttrs or
+    (f: set:
+      listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set)));
 
 
   /* Like `mapAttrs', but allows the name of each attribute to be