diff --git a/Lib/bdb.py b/Lib/bdb.py
index ec0f92c06a787c..6ff947af4c3e0f 100644
--- a/Lib/bdb.py
+++ b/Lib/bdb.py
@@ -328,6 +328,7 @@ def set_trace(self, frame=None):
         self.reset()
         while frame:
             frame.f_trace = self.trace_dispatch
+            frame.f_trace_lines = True
             self.botframe = frame
             frame = frame.f_back
         self.set_step()