diff --git a/bin/run_tests b/bin/run_tests
index 8450a9bfb6744311a96e9a8bfef6702bdcd947bf..241a3fa282411674a0f28d951384e801761bfab9 100755
--- a/bin/run_tests
+++ b/bin/run_tests
@@ -507,7 +507,7 @@ end
 
 if ARGV.include?('--debug') || ARGV.include?('-d')
   DEBUG=true
-  require 'debugger'
+  require 'byebug'
 else
   DEBUG=false
 end