diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index bd60feaa8..38cbb32f5 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -1434,8 +1434,8 @@ class MLComponent(Component):
             out.write('%s:' % (os.path.join(sub_dir, "z3.cmxa")))
             for m in modules:
                 out.write(' %s.cmi' % (os.path.join(sub_dir, m)))
-                out.write(' %s.cmx' % (os.path.join(sub_dir, m)))
-                out.write(' %s.cmo' % (os.path.join(sub_dir, m)))
+                # out.write(' %s.cmx' % (os.path.join(sub_dir, m)))
+                # out.write(' %s.cmo' % (os.path.join(sub_dir, m)))
             out.write('%s/z3native_stubs.o\n' % (sub_dir))
             out.write('\tcd %s ; ocamlmklib -verbose -o z3' % (sub_dir))
             for m in modules:
@@ -1453,11 +1453,15 @@ class MLComponent(Component):
                 for m in modules:
                     out.write(' %s.cma' % (os.path.join(sub_dir, m)))
                     out.write(' %s.cmxa' % (os.path.join(sub_dir, m)))
-                    out.write(' %s.cmxx' % (os.path.join(sub_dir, m)))
-                    out.write(' %s.cmi' % (os.path.join(sub_dir, m)))
                     out.write(' %s.cmx' % (os.path.join(sub_dir, m)))
+                    out.write(' %s.cmxs' % (os.path.join(sub_dir, m)))
+                    out.write(' %s.cmi' % (os.path.join(sub_dir, m)))
                 out.write(' %s' % ((os.path.join(sub_dir, 'libz3$(LIB_EXT)'))))
-                out.write(' %s' % ((os.path.join(sub_dir, 'dllz3$(SO_EXT)'))))
+                out.write(' %s' % ((os.path.join(sub_dir, 'dllz3'))))
+                if IS_WINDOWS:
+                    out.write('.lib')
+                else:
+                    out.write('.so') # .so also on OSX!
                 out.write('\n\n')