diff --git a/README.md b/README.md
index e6629bdc..55698e8d 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,7 @@ information on what to include when reporting a bug.
  - [X11] Bugfix: Decorations could not be enabled after window creation (#1566)
  - [X11] Bugfix: Content scale fallback value could be inconsistent (#1578)
  - [X11] Bugfix: `glfwMaximizeWindow` had no effect on hidden windows
+ - [X11] Bugfix: Clearing `GLFW_FLOATING` on a hidden window caused invalid read
  - [Wayland] Bugfix: The `GLFW_HAND_CURSOR` shape used the wrong image (#1432)
  - [NSGL] Bugfix: `GLFW_COCOA_RETINA_FRAMEBUFFER` had no effect on newer
    macOS versions (#1442)
diff --git a/src/x11_window.c b/src/x11_window.c
index 48e68dae..8f3844af 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -2668,7 +2668,7 @@ void _glfwPlatformSetWindowFloating(_GLFWwindow* window, GLFWbool enabled)
 
             XChangeProperty(_glfw.x11.display, window->x11.handle,
                             _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
-                            PropModeReplace, (unsigned char*) &states, count);
+                            PropModeReplace, (unsigned char*) states, count);
         }
 
         XFree(states);