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--- a/src/utils/x11mon.cpp
+++ b/src/utils/x11mon.cpp
@@ -4,7 +4,7 @@
 #endif
 // Poll state of X11 connectibility (to detect end of user session).
 #include "autoconfig.h"
-#ifndef WITHOUT_X11
+#ifndef DISABLE_X11MON
 #include <stdio.h>
 #include <X11/Xlib.h>
 #include <signal.h>
@@ -64,7 +64,7 @@
 {
     return true;
 }
-#endif /* WITHOUT_X11 */
+#endif /* DISABLE_X11MON */
 
 #else