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-rw-r--r--src/w32term.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/w32term.c b/src/w32term.c
index 7e9c78dde33..ea539a0a1b7 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -2627,7 +2627,7 @@ w32_read_socket (sd, bufp, numchars, waitp, expected)
break;
case WM_SYSCOMMAND:
- switch (msg.msg.wParam)
+ switch (msg.msg.wParam & 0xfff0) /* Lower 4 bits used by Windows. */
{
case SC_CLOSE:
f = x_window_to_frame (dpyinfo, msg.msg.hwnd);