diff --git a/pkgs/by-name/de/den-http-get-updater/package.nix b/pkgs/by-name/de/den-http-get-updater/package.nix
index 106451a..91d8581 100644
--- a/pkgs/by-name/de/den-http-get-updater/package.nix
+++ b/pkgs/by-name/de/den-http-get-updater/package.nix
@@ -5,6 +5,7 @@
   gnused,
   jq,
   nix,
+  uutils-coreutils-noprefix,
   writeScript,
 }:
 
@@ -113,7 +114,7 @@ writeScript "den-http-get-updater" (''
   nixUnpack = lib.optionalString unpack "--unpack";
   nixName = lib.optionalString (!builtins.isNull name) "--name \"${lib.escapeShellArg name}\"";
 in ''
-  for i in {{ 1..30 }}; do
+  for i in {1..30}; do
     nixUrlsResult=$(nix-instantiate --eval --json --strict \
         "${prefetchUrlLocationShellEscape.file}" \
         -A "${prefetchUrlLocationShellEscape.attrpath}"
@@ -125,7 +126,7 @@ in ''
           exit 1
       fi
       echo "prefetchUrlLocation failed (attempt $i)" 1>&2
-      sleep 2
+      ${lib.getExe' uutils-coreutils-noprefix "sleep"} 2
   done