diff --git a/test/ruby/test_stack.rb b/test/ruby/test_stack.rb
index 8a78848322..763aeb6bc2 100644
--- a/test/ruby/test_stack.rb
+++ b/test/ruby/test_stack.rb
@@ -18,6 +18,7 @@ class TestStack < Test::Unit::TestCase
     env = {}
     env['RUBY_FIBER_VM_STACK_SIZE'] = vm_stack_size.to_s if vm_stack_size
     env['RUBY_FIBER_MACHINE_STACK_SIZE'] = machine_stack_size.to_s if machine_stack_size
+    env['ASAN_OPTIONS'] = ENV['ASAN_OPTIONS'] if ENV['ASAN_OPTIONS']
 
     stdout, stderr, status = EnvUtil.invoke_ruby([env, '-e', script], '', true, true, timeout: 30)
     assert(!status.signaled?, FailDesc[status, nil, stderr])
diff --git a/tool/lib/envutil.rb b/tool/lib/envutil.rb
index d9350395fe..323d7100de 100644
--- a/tool/lib/envutil.rb
+++ b/tool/lib/envutil.rb
@@ -150,6 +150,7 @@ module EnvUtil
     if RUBYLIB and lib = child_env["RUBYLIB"]
       child_env["RUBYLIB"] = [lib, RUBYLIB].join(File::PATH_SEPARATOR)
     end
+    child_env['ASAN_OPTIONS'] = ENV['ASAN_OPTIONS'] if ENV['ASAN_OPTIONS']
     args = [args] if args.kind_of?(String)
     pid = spawn(child_env, *precommand, rubybin, *args, **opt)
     in_c.close