diff --git a/CHANGELOG.md b/CHANGELOG.md
index 874a482..81a89cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 - Update `raw-window-handle` to 0.6.
 - Update `winit` in example to 0.29.
 - Update wasm CSS to respect the color scheme (including dark mode)
+- Fix macOS sync backend incorrectly setting the parent window
 
 ## 0.13.0
 - **[Breaking]** Users of the `xdg-portal` feature must now also select the `tokio`
diff --git a/src/backend/macos/file_dialog/panel_ffi.rs b/src/backend/macos/file_dialog/panel_ffi.rs
index 805f623..83bb3f3 100644
--- a/src/backend/macos/file_dialog/panel_ffi.rs
+++ b/src/backend/macos/file_dialog/panel_ffi.rs
@@ -1,11 +1,11 @@
 use crate::FileDialog;
 
-use std::ops::Deref;
+use std::mem;
 use std::path::Path;
 use std::{ops::DerefMut, path::PathBuf};
 
 use objc::{class, msg_send, sel, sel_impl};
-use objc_id::Id;
+use objc_id::{Id, Shared};
 
 use super::super::utils::{INSURL, NSURL};
 
@@ -30,6 +30,7 @@ fn make_nsstring(s: &str) -> Id<NSString> {
 
 pub struct Panel {
     pub(crate) panel: Id<Object>,
+    parent: Option<Id<NSWindow, Shared>>,
     _focus_manager: FocusManager,
     _policy_manager: PolicyManager,
 }
@@ -51,6 +52,7 @@ impl Panel {
             panel: unsafe { Id::from_ptr(panel) },
             _focus_manager,
             _policy_manager,
+            parent: None,
         }
     }
 
@@ -63,6 +65,16 @@ impl Panel {
     }
 
     pub fn run_modal(&self) -> i32 {
+        if let Some(parent) = self.parent.clone() {
+            let completion = { block::ConcreteBlock::new(|_: isize| {}) };
+
+            unsafe {
+                msg_send![self.panel, beginSheetModalForWindow: parent completionHandler: &completion]
+            }
+
+            mem::forget(completion);
+        }
+
         unsafe { msg_send![self.panel, runModal] }
     }
 
@@ -130,11 +142,8 @@ impl Panel {
         }
     }
 
-    pub fn set_parent(&self, parent: &RawWindowHandle) {
-        let id = NSWindow::from_raw_window_handle(parent);
-        unsafe {
-            let () = msg_send![id, addChildWindow: self.panel.deref() ordered: 1];
-        }
+    pub fn set_parent(&mut self, parent: &RawWindowHandle) {
+        self.parent = Some(NSWindow::from_raw_window_handle(parent).share());
     }
 
     pub fn get_result(&self) -> PathBuf {
@@ -162,7 +171,7 @@ impl Panel {
 
 impl Panel {
     pub fn build_pick_file(opt: &FileDialog) -> Self {
-        let panel = Panel::open_panel();
+        let mut panel = Panel::open_panel();
 
         if !opt.filters.is_empty() {
             panel.add_filters(&opt);
@@ -191,7 +200,7 @@ impl Panel {
     }
 
     pub fn build_save_file(opt: &FileDialog) -> Self {
-        let panel = Panel::save_panel();
+        let mut panel = Panel::save_panel();
 
         if !opt.filters.is_empty() {
             panel.add_filters(&opt);
@@ -217,7 +226,7 @@ impl Panel {
     }
 
     pub fn build_pick_folder(opt: &FileDialog) -> Self {
-        let panel = Panel::open_panel();
+        let mut panel = Panel::open_panel();
 
         if let Some(path) = &opt.starting_directory {
             panel.set_path(path, opt.file_name.as_deref());
@@ -239,7 +248,7 @@ impl Panel {
     }
 
     pub fn build_pick_folders(opt: &FileDialog) -> Self {
-        let panel = Panel::open_panel();
+        let mut panel = Panel::open_panel();
 
         if let Some(path) = &opt.starting_directory {
             panel.set_path(path, opt.file_name.as_deref());
@@ -262,7 +271,7 @@ impl Panel {
     }
 
     pub fn build_pick_files(opt: &FileDialog) -> Self {
-        let panel = Panel::open_panel();
+        let mut panel = Panel::open_panel();
 
         if !opt.filters.is_empty() {
             panel.add_filters(&opt);
diff --git a/src/backend/macos/message_dialog.rs b/src/backend/macos/message_dialog.rs
index f7bdc39..b75dd63 100644
--- a/src/backend/macos/message_dialog.rs
+++ b/src/backend/macos/message_dialog.rs
@@ -1,3 +1,4 @@
+use std::mem;
 use std::ops::DerefMut;
 
 use crate::backend::DialogFutureType;
@@ -9,7 +10,7 @@ use super::{
     AsModal,
 };
 
-use super::utils::{INSWindow, NSWindow};
+use super::utils::{INSApplication, INSWindow, NSApplication, NSWindow};
 use objc::runtime::Object;
 use objc::{class, msg_send, sel, sel_impl};
 use objc_foundation::{INSString, NSString};
@@ -35,6 +36,7 @@ enum NSAlertReturn {
 pub struct NSAlert {
     buttons: MessageButtons,
     alert: Id<Object>,
+    parent: Option<Id<NSWindow>>,
     _focus_manager: FocusManager,
     _policy_manager: PolicyManager,
 }
@@ -93,13 +95,30 @@ impl NSAlert {
 
         Self {
             alert: unsafe { Id::from_retained_ptr(alert) },
+            parent: opt.parent.map(|x| NSWindow::from_raw_window_handle(&x)),
             buttons: opt.buttons,
             _focus_manager,
             _policy_manager,
         }
     }
 
-    pub fn run(self) -> MessageDialogResult {
+    pub fn run(mut self) -> MessageDialogResult {
+        if let Some(parent) = self.parent.take() {
+            let completion = {
+                block::ConcreteBlock::new(|result: isize| {
+                    let _: () = unsafe {
+                        msg_send![NSApplication::shared_application(), stopModalWithCode: result]
+                    };
+                })
+            };
+
+            unsafe {
+                msg_send![self.alert, beginSheetModalForWindow: parent completionHandler: &completion]
+            }
+
+            mem::forget(completion);
+        }
+
         let ret: i64 = unsafe { msg_send![self.alert, runModal] };
         dialog_result(&self.buttons, ret)
     }