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-rw-r--r--pkgs/development/interpreters/ruby/gems.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/interpreters/ruby/gems.nix b/pkgs/development/interpreters/ruby/gems.nix
index cb91d92c382..2dd1739d49f 100644
--- a/pkgs/development/interpreters/ruby/gems.nix
+++ b/pkgs/development/interpreters/ruby/gems.nix
@@ -48,7 +48,7 @@ in
   importGems = file: args:
     let
       # 1. Load set of gem names and versions from a bundix-created expression.
-      gemset = callPackage file { };
+      gemset = if (builtins.isAttrs file) then file else (callPackage file { });
       # 2. Allow gems to be overriden by providing a derivation yourself.
       config = gemset // (args gemset);
       # 3.