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-rw-r--r--lib/strings.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/strings.nix b/lib/strings.nix
index 86c92bdaa15..a111e1e2597 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -89,7 +89,7 @@ rec {
         => "usr/local/bin"
   */
   concatStringsSep = builtins.concatStringsSep or (separator: list:
-    concatStrings (intersperse separator list));
+    lib.foldl' (x: y: x + y) "" (intersperse separator list));
 
   /* Maps a function over a list of strings and then concatenates the
      result with the specified separator interspersed between