diff --git a/osdep/mac/dialog.swift b/osdep/mac/dialog.swift
index 6f8b6b01fd..2223ba6a8b 100644
--- a/osdep/mac/dialog.swift
+++ b/osdep/mac/dialog.swift
@@ -18,7 +18,7 @@
 import Cocoa
 import UniformTypeIdentifiers
 
-class Dialog {
+class Dialog: NSObject, NSWindowDelegate, NSOpenSavePanelDelegate {
     var option: OptionHelper?
 
     init(_ option: OptionHelper? = nil) {
@@ -48,6 +48,7 @@ class Dialog {
         panel.canChooseDirectories = directories
         panel.allowsMultipleSelection = multiple
         panel.allowedContentTypes = types
+        panel.delegate = self
 
         if panel.runModal() == .OK {
             return panel.urls.map { $0.path }
@@ -83,4 +84,8 @@ class Dialog {
         alert.addButton(withTitle: "Ok")
         alert.runModal()
     }
+
+    func windowDidBecomeKey(_ notification: Notification) {
+        AppHub.shared.input.put(key: MP_INPUT_RELEASE_ALL)
+    }
 }