diff --git a/test/ruby/test_complex.rb b/test/ruby/test_complex.rb
index e977e7a058..bfa9859199 100644
--- a/test/ruby/test_complex.rb
+++ b/test/ruby/test_complex.rb
@@ -4,7 +4,7 @@ class ComplexSub < Complex; end
 
 class Complex_Test < Test::Unit::TestCase
 
-  def test_sub
+  def test_compsub
     c = ComplexSub.__send__(:new, 1)
     cc = ComplexSub.__send__(:convert, 1)
     if defined?(ComplexSub::Unify)
@@ -314,7 +314,7 @@ class Complex_Test < Test::Unit::TestCase
     end
   end
 
-  def test_sub2
+  def test_sub
     c = Complex(1,2)
     c2 = Complex(2,3)
 
diff --git a/test/ruby/test_rational.rb b/test/ruby/test_rational.rb
index 3fefa766b1..8062d3fad1 100644
--- a/test/ruby/test_rational.rb
+++ b/test/ruby/test_rational.rb
@@ -4,7 +4,7 @@ class RationalSub < Rational; end
 
 class Rational_Test < Test::Unit::TestCase
 
-  def test_sub
+  def test_ratsub
     c = RationalSub.__send__(:new, 1)
     cc = RationalSub.__send__(:convert, 1)
     if defined?(RationalSub::Unify)