diff --git a/pkgs/tools/backup/borg/default.nix b/pkgs/tools/backup/borg/default.nix
index 4368218ae7b..4ff61d1ac95 100644
--- a/pkgs/tools/backup/borg/default.nix
+++ b/pkgs/tools/backup/borg/default.nix
@@ -13,7 +13,7 @@ python3Packages.buildPythonApplication rec {
 
   nativeBuildInputs = with python3Packages; [
     # For building documentation:
-    sphinx sphinx_rtd_theme
+    sphinx guzzle_sphinx_theme
   ];
   buildInputs = [
     acl lz4 openssl python3Packages.setuptools_scm