diff --git a/prepare.py b/prepare.py
index e60d272a3..2b442235b 100755
--- a/prepare.py
+++ b/prepare.py
@@ -154,8 +154,11 @@ class DesktopPreparator(prepare.Preparator):
         ret |= not self.check_python_module_is_present('six')
         if "python" in self.args.target or "python-raspberry" in self.args.target:
             ret |= not self.check_python_module_is_present('wheel')
+
         if os.path.isdir('submodules/oRTP'):
-	    os.rmdir('submodules/oRTP')
+            import shutil
+            shutil.rmtree('submodules/oRTP')
+
         return ret
 
     def show_missing_dependencies(self):