diff --git a/nixos/modules/services/misc/redmine.nix b/nixos/modules/services/misc/redmine.nix
index 059cc18733b..eb6575887d5 100644
--- a/nixos/modules/services/misc/redmine.nix
+++ b/nixos/modules/services/misc/redmine.nix
@@ -154,7 +154,7 @@ in {
       environment.HOME = "${pkgs.redmine}/share/redmine";
       environment.REDMINE_LANG = "en";
       environment.GEM_HOME = "${pkgs.redmine}/share/redmine/vendor/bundle/ruby/1.9.1";
-      environment.GEM_PATH = "${bundler}/${bundler.ruby.gemPath}";
+      environment.GEM_PATH = "${pkgs.bundler}/${pkgs.bundler.ruby.gemPath}";
       path = with pkgs; [
         imagemagickBig
         subversion