diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 1b55db09503..f1c3e75bb73 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -3711,6 +3711,8 @@ def __PYTHON_EL_native_completion_setup():
             readline.parse_and_bind('tab: complete')
             # Require just one tab to send output.
             readline.parse_and_bind('set show-all-if-ambiguous on')
+            # Avoid replacing common prefix with ellipsis.
+            readline.parse_and_bind('set completion-prefix-display-length 0')
 
         print ('python.el: native completion setup loaded')
     except: