diff --git a/test/net/smtp/test_sslcontext.rb b/test/net/smtp/test_sslcontext.rb
index f3f3b347ad..80afc1338e 100644
--- a/test/net/smtp/test_sslcontext.rb
+++ b/test/net/smtp/test_sslcontext.rb
@@ -125,4 +125,4 @@ module Net
     end
 
   end
-end
+end unless /mswin|mingw/ =~ RUBY_PLATFORM
diff --git a/test/net/smtp/test_starttls.rb b/test/net/smtp/test_starttls.rb
index 98835c952a..2c812aea67 100644
--- a/test/net/smtp/test_starttls.rb
+++ b/test/net/smtp/test_starttls.rb
@@ -118,4 +118,4 @@ module Net
       assert_nothing_raised { smtp.enable_starttls_auto }
     end
   end
-end
+end unless /mswin|mingw/ =~ RUBY_PLATFORM