diff --git a/dwm.c b/dwm.c
index 275a67c..b8e839e 100644
--- a/dwm.c
+++ b/dwm.c
@@ -78,7 +78,7 @@
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel, SchemeLast }; /* color schemes */
-enum { NetSupported, NetWMName, NetWMState,
+enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetSystemTray, NetSystemTrayOP, NetSystemTrayOrientation, NetSystemTrayOrientationHorz,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */