diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index 6f16ac3062..7911a0cb20 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -1567,7 +1567,7 @@ class TestProcess < Test::Unit::TestCase
   end
 
   def test_seteuid_name
-    user = ENV["USER"] or return
+    user = (Etc.getpwuid(Process.euid).name rescue ENV["USER"]) or return
     assert_nothing_raised(TypeError) {Process.euid = user}
   rescue NotImplementedError
   end