diff --git a/Lib/pdb.py b/Lib/pdb.py
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -1039,6 +1039,10 @@
             try:
                 self._previous_sigint_handler = \
                     signal.signal(signal.SIGINT, self.sigint_handler)
+                if (self._previous_sigint_handler.__module__ == 'pdb' and
+                        self._previous_sigint_handler.__qualname__ ==
+                        'Pdb.sigint_handler'):
+                    self._previous_sigint_handler = signal.SIG_DFL
             except ValueError:
                 # ValueError happens when do_continue() is invoked from
                 # a non-main thread in which case we just continue without