diff --git a/pkgs/development/compilers/crystal/build-package.nix b/pkgs/development/compilers/crystal/build-package.nix
index e1ff7d08fb54..cb5869392b6b 100644
--- a/pkgs/development/compilers/crystal/build-package.nix
+++ b/pkgs/development/compilers/crystal/build-package.nix
@@ -71,8 +71,7 @@ let
 in
 stdenv.mkDerivation (mkDerivationArgs // {
 
-  configurePhase = args.configurePhase or lib.concatStringsSep "\n"
-    (
+  configurePhase = args.configurePhase or (lib.concatStringsSep "\n" (
       [
         "runHook preConfigure"
       ]
@@ -83,7 +82,7 @@ stdenv.mkDerivation (mkDerivationArgs // {
         "cp shard.lock lib/.shards.info"
       ]
       ++ [ "runHook postConfigure" ]
-    );
+    ));
 
   CRFLAGS = lib.concatStringsSep " " defaultOptions;