diff --git a/pkgs/by-name/lo/lowdown/package.nix b/pkgs/by-name/lo/lowdown/package.nix
index 6a4cadc42939..ba2e5c7c505a 100644
--- a/pkgs/by-name/lo/lowdown/package.nix
+++ b/pkgs/by-name/lo/lowdown/package.nix
@@ -98,7 +98,7 @@ stdenv.mkDerivation rec {
     runHook preInstallCheck
 
     echo '# TEST' > test.md
-    $out/bin/lowdown test.md
+    $out/bin/lowdown test.md | grep '[hH]1'
 
     runHook postInstallCheck
   '';