diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index 09af0552ecc83339d8fc34ecb8e3f9a947d6c604..7b2bc537162a1d0bee7110a12b4112bd2c85a108 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -385,7 +385,7 @@ class RubyLanguage(object):
   def pre_build_steps(self):
     return [['tools/run_tests/pre_build_ruby.sh']]
 
-  def make_targets(self, test_regex):
+  def make_targets(self):
     return []
 
   def make_options(self):