diff --git a/MapControl/Shared/GroundOverlay.cs b/MapControl/Shared/GroundOverlay.cs
index 09a126dd..168418be 100644
--- a/MapControl/Shared/GroundOverlay.cs
+++ b/MapControl/Shared/GroundOverlay.cs
@@ -48,13 +48,20 @@ namespace MapControl
 
                 if (entry != null)
                 {
+                    MemoryStream memoryStream;
+
+                    // ZipArchive does not support multithreading, synchronously copy ZipArchiveEntry stream to MemoryStream.
+                    //
                     using (var zipStream = entry.Open())
-                    using (var memoryStream = new MemoryStream((int)zipStream.Length))
                     {
-                        zipStream.CopyTo(memoryStream); // CopyToAsync won't work with ZipArchive
+                        memoryStream = new MemoryStream((int)zipStream.Length);
+                        zipStream.CopyTo(memoryStream);
                         memoryStream.Seek(0, SeekOrigin.Begin);
-                        imageSource = await ImageLoader.LoadImageAsync(memoryStream);
                     }
+
+                    // Close Zip Stream before awaiting.
+                    //
+                    imageSource = await ImageLoader.LoadImageAsync(memoryStream);
                 }
             }
 
diff --git a/MapControl/Shared/ImageLoader.cs b/MapControl/Shared/ImageLoader.cs
index 868ca7d7..7e392d22 100644
--- a/MapControl/Shared/ImageLoader.cs
+++ b/MapControl/Shared/ImageLoader.cs
@@ -31,12 +31,9 @@ namespace MapControl
             HttpClient.DefaultRequestHeaders.Add("User-Agent", $"XAML-Map-Control/{typeof(ImageLoader).Assembly.GetName().Version}");
         }
 
-        public static async Task<ImageSource> LoadImageAsync(byte[] buffer)
+        public static Task<ImageSource> LoadImageAsync(byte[] buffer)
         {
-            using (var stream = new MemoryStream(buffer))
-            {
-                return await LoadImageAsync(stream);
-            }
+            return LoadImageAsync(new MemoryStream(buffer));
         }
 
         public static async Task<ImageSource> LoadImageAsync(Uri uri, IProgress<double> progress = null)
diff --git a/MapControl/WinUI/ImageLoader.WinUI.cs b/MapControl/WinUI/ImageLoader.WinUI.cs
index e73315d8..a0c2e3c5 100644
--- a/MapControl/WinUI/ImageLoader.WinUI.cs
+++ b/MapControl/WinUI/ImageLoader.WinUI.cs
@@ -78,11 +78,9 @@ namespace MapControl
 
                 if (response?.Buffer != null)
                 {
-                    using (var memoryStream = new MemoryStream(response.Buffer))
-                    using (var randomAccessStream = memoryStream.AsRandomAccessStream())
+                    using (var stream = new MemoryStream(response.Buffer).AsRandomAccessStream())
                     {
-                        var decoder = await BitmapDecoder.CreateAsync(randomAccessStream);
-
+                        var decoder = await BitmapDecoder.CreateAsync(stream);
                         bitmap = await LoadWriteableBitmapAsync(decoder);
                     }
                 }