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-rw-r--r--pkgs/build-support/fetchdocker/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/build-support/fetchdocker/default.nix b/pkgs/build-support/fetchdocker/default.nix
index 3556df32d92..bbd2bae46df 100644
--- a/pkgs/build-support/fetchdocker/default.nix
+++ b/pkgs/build-support/fetchdocker/default.nix
@@ -22,8 +22,8 @@ assert null == lib.findFirst (c: "/"==c) null (lib.stringToCharacters repository
 assert null == lib.findFirst (c: "/"==c) null (lib.stringToCharacters imageName);
 
 let
-  # Abuse `builtins.toPath` to collapse possible double slashes
-  repoTag0 = builtins.toString (builtins.toPath "/${stripScheme registry}/${repository}/${imageName}");
+  # Abuse paths to collapse possible double slashes
+  repoTag0 = builtins.toString (/. + "/${stripScheme registry}/${repository}/${imageName}");
   repoTag1 = lib.removePrefix "/" repoTag0;
 
   layers = builtins.map stripNixStore imageLayers;