diff --git a/src/java/org/lwjgl/opengl/WindowsDisplay.java b/src/java/org/lwjgl/opengl/WindowsDisplay.java
index 57d0ac9b..3cc59c99 100644
--- a/src/java/org/lwjgl/opengl/WindowsDisplay.java
+++ b/src/java/org/lwjgl/opengl/WindowsDisplay.java
@@ -565,7 +565,7 @@ final class WindowsDisplay implements DisplayImplementation {
 				close_requested = true;
 				return true;
 			case WM_SYSCOMMAND:
-				switch ((int)wParam) {
+				switch ((int)(wParam & 0xfff0)) {
 					case SC_KEYMENU:
 					case SC_MOUSEMENU:
 					case SC_SCREENSAVE: