diff --git a/Lib/idlelib/calltip_w.py b/Lib/idlelib/calltip_w.py
index 34531f4..1b1ffc5 100644
--- a/Lib/idlelib/calltip_w.py
+++ b/Lib/idlelib/calltip_w.py
@@ -72,6 +72,7 @@
                            background="#ffffe0", relief=SOLID, borderwidth=1,
                            font = self.widget['font'])
         self.label.pack()
+        tw.update_idletasks()
         tw.lift()  # work around bug in Tk 8.5.18+ (issue #24570)
 
         self.checkhideid = self.widget.bind(CHECKHIDE_VIRTUAL_EVENT_NAME,
diff --git a/Misc/NEWS.d/next/IDLE/2018-08-02-22-16-42.bpo-34275.Iu0d7t.rst b/Misc/NEWS.d/next/IDLE/2018-08-02-22-16-42.bpo-34275.Iu0d7t.rst
new file mode 100644
index 0000000..d7eba7a
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2018-08-02-22-16-42.bpo-34275.Iu0d7t.rst
@@ -0,0 +1,2 @@
+Make IDLE calltips always visible on Mac. Some MacOS-tk combinations need
+.update_idletasks(). Patch by Kevin Walzer.