diff --git a/Gemfile b/Gemfile
index 01c1d63..ddfba11 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 if RUBY_VERSION >= "2.7"
   gem "irb"
-  gem "debug"
+  gem "debug", platform: :mri
 end
 
 gemspec