diff --git a/spec/ruby/library/socket/socket/gethostbyaddr_spec.rb b/spec/ruby/library/socket/socket/gethostbyaddr_spec.rb
index cad6ed2dd0..b5f5942668 100644
--- a/spec/ruby/library/socket/socket/gethostbyaddr_spec.rb
+++ b/spec/ruby/library/socket/socket/gethostbyaddr_spec.rb
@@ -18,8 +18,11 @@ describe 'Socket.gethostbyaddr' do
           @array = Socket.gethostbyaddr(@addr)
         end
 
-        it 'includes the hostname as the first value' do
-          @array[0].should == SocketSpecs.hostname_reverse_lookup
+        # RubyCI Solaris 11x defines 127.0.0.1 as unstable11x
+        platform_is_not :"solaris2.11" do
+          it 'includes the hostname as the first value' do
+            @array[0].should == SocketSpecs.hostname_reverse_lookup
+          end
         end
 
         it 'includes the aliases as the 2nd value' do