diff --git a/src/lym/unit_tests/unit_tests.pro b/src/lym/unit_tests/unit_tests.pro
index 8aec7683c..f6947c4d2 100644
--- a/src/lym/unit_tests/unit_tests.pro
+++ b/src/lym/unit_tests/unit_tests.pro
@@ -12,5 +12,17 @@ SOURCES = \
 INCLUDEPATH += $$RBA_INC $$PYA_INC $$LYM_INC $$TL_INC $$GSI_INC
 DEPENDPATH += $$RBA_INC $$PYA_INC $$LYM_INC $$TL_INC $$GSI_INC
 
-LIBS += -L$$DESTDIR_UT -lklayout_rba -lklayout_pya -lklayout_lym -lklayout_tl -lklayout_gsi
+LIBS += -L$$DESTDIR_UT -lklayout_lym -lklayout_tl -lklayout_gsi
+
+equals(HAVE_RUBY, "1") {
+  LIBS += -lklayout_rba
+} else {
+  LIBS += -lklayout_rbastub
+}
+
+equals(HAVE_PYTHON, "1") {
+  LIBS += -lklayout_pya
+} else {
+  LIBS += -lklayout_pyastub
+}
 
diff --git a/src/rba/rba/rba.cc b/src/rba/rba/rba.cc
index 3ee9dd964..6de8b89fd 100644
--- a/src/rba/rba/rba.cc
+++ b/src/rba/rba/rba.cc
@@ -1010,16 +1010,29 @@ method_adaptor (int mid, int argc, VALUE *argv, VALUE self, bool ctor)
 
       static ID id_to_enum = rb_intern ("to_enum");
 
-      VALUE method_sym = ID2SYM (rb_intern (meth->primary_name ().c_str ()));
+      VALUE method_sym = ID2SYM (rb_intern2 (meth->primary_name ().c_str (), (long) meth->primary_name ().size ()));
 
       if (argc == 0) {
         ret = rba_funcall2_checked (self, id_to_enum, 1, &method_sym);
       } else {
+#if 0
+	//  this solution does not work on MSVC2017 for unknown reasons and 
+	//  makes the application segfault even without being called
         std::vector<VALUE> new_args;
         new_args.reserve (size_t (argc + 1));
         new_args.push_back (method_sym);
         new_args.insert (new_args.end (), argv, argv + argc);
         ret = rba_funcall2_checked (self, id_to_enum, argc + 1, new_args.begin ().operator-> ());
+#else
+	VALUE new_args[16];
+	tl_assert (argc + 1 <= sizeof(new_args) / sizeof(new_args[0]));
+	VALUE *a = &new_args[0];
+	*a++ = method_sym;
+	for (int i = 0; i < argc; ++i) {
+	  *a++ = argv[i];
+	}
+        ret = rba_funcall2_checked (self, id_to_enum, argc + 1, &new_args[0]);
+#endif
       }
 
     } else {
diff --git a/testdata/ruby/qtbinding.rb b/testdata/ruby/qtbinding.rb
index f8b7471d4..54b596542 100644
--- a/testdata/ruby/qtbinding.rb
+++ b/testdata/ruby/qtbinding.rb
@@ -679,9 +679,16 @@ class QtBinding_TestClass < TestBase
 
     w = RBA::QObject::new
 
-    on = nil
-    w.objectNameChanged do |name|
-      on = name
+    if w.respond_to?(:objectNameChanged)   # Qt5
+
+      on = nil
+      w.objectNameChanged do |name|
+        on = name
+      end
+
+      w.objectName = "uvw"
+      assert_equal(on, "uvw")
+
     end
 
     od = false
@@ -689,12 +696,7 @@ class QtBinding_TestClass < TestBase
       od = true
     end
 
-    w.objectName = "uvw"
-
-    assert_equal(on, "uvw")
-
     w._destroy
-
     assert_equal(od, true)
 
   end