diff --git a/src/table/sprites.h b/src/table/sprites.h
--- a/src/table/sprites.h
+++ b/src/table/sprites.h
@@ -48,7 +48,7 @@ enum Sprites {
 	SPR_ASCII_SPACE_BIG   = 450,
 
 	/* Extra graphic spritenumbers */
-	OPENTTD_SPRITES_COUNT = 116, // number of gfx-sprites in openttd.grf
+	OPENTTD_SPRITES_COUNT = 117, // number of gfx-sprites in openttd.grf
 	SPR_SIGNALS_BASE  = 4896,
 	SPR_CANALS_BASE   = SPR_SIGNALS_BASE + 486,
 	SPR_SLOPES_BASE   = SPR_CANALS_BASE + 70,
@@ -95,6 +95,8 @@ enum Sprites {
 
 	SPR_SHARED_ORDERS_ICON = SPR_OPENTTD_BASE + 115,
 
+	SPR_WARNING_SIGN      = SPR_OPENTTD_BASE + 116, // warning sign (shown if there are any newgrf errors)
+
 	/* Network GUI sprites */
 	SPR_SQUARE = SPR_OPENTTD_BASE + 20,     // colored square (used for newgrf compatibility)
 	SPR_LOCK = SPR_OPENTTD_BASE + 19,       // lock icon (for password protected servers)