diff --git a/python/helpers/pydev/pydevd.py b/python/helpers/pydev/pydevd.py
index 367fa69b1cbb..132c133b2c18 100644
--- a/python/helpers/pydev/pydevd.py
+++ b/python/helpers/pydev/pydevd.py
@@ -1245,8 +1245,6 @@ class PyDB(object):
 
     def prepare_to_run(self, enable_tracing_from_start=True):
         ''' Shared code to prepare debugging by installing traces and registering threads '''
-        self.patch_threads()
-
         self._create_pydb_command_thread()
         if self.redirect_output or self.signature_factory is not None or self.thread_analyser is not None:
             # we need all data to be sent to IDE even after program finishes