diff --git a/pkgs/development/compilers/crystal/build-package.nix b/pkgs/development/compilers/crystal/build-package.nix
index 67c8128f6b5d..8c788b80bf0c 100644
--- a/pkgs/development/compilers/crystal/build-package.nix
+++ b/pkgs/development/compilers/crystal/build-package.nix
@@ -120,7 +120,7 @@ stdenv.mkDerivation (mkDerivationArgs // {
 
   installCheckPhase = args.installCheckPhase or ''
     for f in $out/bin/*; do
-      $f --help
+      $f --help > /dev/null
     done
   '';