diff --git a/nixos/modules/misc/documentation.nix b/nixos/modules/misc/documentation.nix
index 2a25f8e56468..26323e14b901 100644
--- a/nixos/modules/misc/documentation.nix
+++ b/nixos/modules/misc/documentation.nix
@@ -101,6 +101,7 @@ let
           libPath = filter (pkgs.path + "/lib");
           pkgsLibPath = filter (pkgs.path + "/pkgs/pkgs-lib");
           nixosPath = filter (pkgs.path + "/nixos");
+          NIX_ABORT_ON_WARN = warningsAreErrors;
           modules =
             "[ "
             + concatMapStringsSep " " (p: ''"${removePrefix "${modulesPath}/" (toString p)}"'') docModules.lazy