diff --git a/CHANGELOG.md b/CHANGELOG.md
index f551ec48..15d7cd2a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and `WindowEvent::HoveredFile`.
 - On Windows, fix edge case where `RedrawRequested` could be dispatched before input events in event loop iteration.
 - On Windows, fix timing issue that could cause events to be improperly dispatched after `RedrawRequested` but before `EventsCleared`.
 - On macOS, drop unused Metal dependency.
+- On Windows, fix the trail effect happening on transparent decorated windows. Borderless (or un-decorated) windows were not affected.
 - On Windows, fix `with_maximized` not properly setting window size to entire window.
 
 # 0.20.0 Alpha 1
diff --git a/src/platform_impl/windows/window_state.rs b/src/platform_impl/windows/window_state.rs
index 8d807b54..9d494508 100644
--- a/src/platform_impl/windows/window_state.rs
+++ b/src/platform_impl/windows/window_state.rs
@@ -219,8 +219,9 @@ impl WindowFlags {
         if self.contains(WindowFlags::NO_BACK_BUFFER) {
             style_ex |= WS_EX_NOREDIRECTIONBITMAP;
         }
-        // if self.contains(WindowFlags::TRANSPARENT) {
-        // }
+        if self.contains(WindowFlags::TRANSPARENT) && self.contains(WindowFlags::DECORATIONS) {
+            style_ex |= WS_EX_LAYERED;
+        }
         if self.contains(WindowFlags::CHILD) {
             style |= WS_CHILD; // This is incompatible with WS_POPUP if that gets added eventually.
         }