diff --git a/Lib/idlelib/autocomplete_w.py b/Lib/idlelib/autocomplete_w.py
index 5bd7ce7f5e5..24320b5a3bf 100644
--- a/Lib/idlelib/autocomplete_w.py
+++ b/Lib/idlelib/autocomplete_w.py
@@ -186,7 +186,7 @@ class AutoCompleteWindow:
         acw.withdraw()
         acw.wm_overrideredirect(1)
         try:
-            # Prevent grabbing focus on maxOS.
+            # Prevent grabbing focus on macOS.
             acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w,
                         "help", "noActivates")
         except TclError: