diff --git a/pkgs/applications/version-management/gitaly/default.nix b/pkgs/applications/version-management/gitaly/default.nix
index 375e7ad001d..52d46a99118 100644
--- a/pkgs/applications/version-management/gitaly/default.nix
+++ b/pkgs/applications/version-management/gitaly/default.nix
@@ -23,6 +23,8 @@ in buildGoPackage rec {
     inherit rubyEnv;
   };
 
+  buildInputs = [rubyEnv.wrappedRuby];
+
   postInstall = ''
     mkdir -p $ruby
     cp -rv $src/ruby/{bin,lib,vendor} $ruby