diff --git a/unix/xserver/hw/vnc/xorg-version.h b/unix/xserver/hw/vnc/xorg-version.h
index 8cc1c86..60610cb 100644
--- a/unix/xserver/hw/vnc/xorg-version.h
+++ b/unix/xserver/hw/vnc/xorg-version.h
@@ -48,8 +48,10 @@
 #define XORG 116
 #elif XORG_VERSION_CURRENT < ((1 * 10000000) + (17 * 100000) + (99 * 1000))
 #define XORG 117
+#elif XORG_VERSION_CURRENT < ((1 * 10000000) + (18 * 100000) + (99 * 1000))
+#define XORG 118
 #else
-#error "X.Org newer than 1.17 is not supported"
+#error "X.Org newer than 1.18 is not supported"
 #endif
 
 #endif