diff --git a/CHANGELOG.md b/CHANGELOG.md
index a37fe9aa..3cfd9f5c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -51,6 +51,7 @@ and `WindowEvent::HoveredFile`.
 - 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.
 - On macOS, change `WindowExtMacOS::request_user_attention()` to take an `enum` instead of a `bool`.
+- On Windows, unset `maximized` when manually changing the window's position or size.
 
 # 0.20.0 Alpha 1 (2019-06-21)
 
diff --git a/src/platform_impl/windows/window.rs b/src/platform_impl/windows/window.rs
index 8704ccfb..5b55c7c8 100644
--- a/src/platform_impl/windows/window.rs
+++ b/src/platform_impl/windows/window.rs
@@ -212,6 +212,15 @@ impl Window {
     pub fn set_outer_position(&self, logical_position: LogicalPosition) {
         let dpi_factor = self.hidpi_factor();
         let (x, y) = logical_position.to_physical(dpi_factor).into();
+
+        let window_state = Arc::clone(&self.window_state);
+        let window = self.window.clone();
+        self.thread_executor.execute_in_thread(move || {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MAXIMIZED, false)
+            });
+        });
+
         self.set_position_physical(x, y);
     }
 
@@ -287,6 +296,15 @@ impl Window {
     pub fn set_inner_size(&self, logical_size: LogicalSize) {
         let dpi_factor = self.hidpi_factor();
         let (width, height) = logical_size.to_physical(dpi_factor).into();
+
+        let window_state = Arc::clone(&self.window_state);
+        let window = self.window.clone();
+        self.thread_executor.execute_in_thread(move || {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MAXIMIZED, false)
+            });
+        });
+
         self.set_inner_size_physical(width, height);
     }
 
diff --git a/src/window.rs b/src/window.rs
index 7866b70d..db86773d 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -413,7 +413,8 @@ impl Window {
 
     /// Modifies the position of the window.
     ///
-    /// See `outer_position` for more information about the coordinates.
+    /// See `outer_position` for more information about the coordinates. This automatically un-maximizes the
+    /// window if it's maximized.
     ///
     /// ## Platform-specific
     ///
@@ -443,7 +444,8 @@ impl Window {
 
     /// Modifies the inner size of the window.
     ///
-    /// See `inner_size` for more information about the values.
+    /// See `inner_size` for more information about the values. This automatically un-maximizes the
+    /// window if it's maximized.
     ///
     /// ## Platform-specific
     ///