diff --git a/test/ruby/test_whileuntil.rb b/test/ruby/test_whileuntil.rb
index 394383a799..121c44817d 100644
--- a/test/ruby/test_whileuntil.rb
+++ b/test/ruby/test_whileuntil.rb
@@ -61,7 +61,7 @@ class TestWhileuntil < Test::Unit::TestCase
 
       tmp = open(tmpfilename, "r")
       while line = tmp.gets()
-        break if 3
+        break if $. == 3
         assert_no_match(/vt100/, line)
         assert_no_match(/Amiga/, line)
         assert_no_match(/paper/, line)