diff --git a/src/lang/english.txt b/src/lang/english.txt
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -2449,6 +2449,7 @@ STR_NEWGRF_ERROR_INVALID_ID             
 STR_NEWGRF_ERROR_CORRUPT_SPRITE                                 :{YELLOW}{RAW_STRING} contains a corrupt sprite. All corrupt sprites will be shown as a red question mark (?).
 STR_NEWGRF_ERROR_MULTIPLE_ACTION_8                              :Contains multiple Action 8 entries.
 STR_NEWGRF_ERROR_READ_BOUNDS                                    :Read past end of pseudo-sprite.
+STR_NEWGRF_ERROR_MISSING_SPRITES                                :{WHITE}The currently used base graphics set is missing a number of sprites.{}Please update the base graphics set.
 
 # NewGRF related 'general' warnings
 STR_NEWGRF_POPUP_CAUTION_CAPTION                                :{WHITE}Caution!