diff --git a/pkgs/development/compilers/mruby/default.nix b/pkgs/development/compilers/mruby/default.nix
index cf93d7783836..be3064884793 100644
--- a/pkgs/development/compilers/mruby/default.nix
+++ b/pkgs/development/compilers/mruby/default.nix
@@ -13,6 +13,10 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ ruby bison ];
 
+  # Necessary so it uses `gcc` instead of `ld` for linking.
+  # https://github.com/mruby/mruby/blob/35be8b252495d92ca811d76996f03c470ee33380/tasks/toolchains/gcc.rake#L25
+  preBuild = if stdenv.isLinux then "unset LD" else null;
+
   installPhase = ''
     mkdir $out
     cp -R build/host/{bin,lib} $out