diff --git a/pkgs/development/compilers/crystal/build-package.nix b/pkgs/development/compilers/crystal/build-package.nix
index 7914b7d7771e..f115cae48916 100644
--- a/pkgs/development/compilers/crystal/build-package.nix
+++ b/pkgs/development/compilers/crystal/build-package.nix
@@ -196,7 +196,7 @@ stdenv.mkDerivation (
     installCheckPhase =
       args.installCheckPhase or ''
         for f in $out/bin/*; do
-          if [ $f == $out/bin/*.dwarf ]; then
+          if [[ $f == *.dwarf ]]; then
             continue
           fi
           $f --help > /dev/null