diff --git a/flake.nix b/flake.nix
index 77f657814..3009b3374 100644
--- a/flake.nix
+++ b/flake.nix
@@ -384,7 +384,7 @@
           sphinx-argparse sphinxcontrib-wavedrom latex-artiq-manual
         ];
         shellHook = ''
-	  export QT_PLUGIN_PATH=${pkgs.qt5.qtbase}/${pkgs.qt5.qtbase.dev.qtPluginPrefix}
+          export QT_PLUGIN_PATH=${pkgs.qt5.qtbase}/${pkgs.qt5.qtbase.dev.qtPluginPrefix}
           export QML2_IMPORT_PATH=${pkgs.qt5.qtbase}/${pkgs.qt5.qtbase.dev.qtQmlPrefix}
         '';
       };