diff --git a/src/newgrf_spritegroup.h b/src/newgrf_spritegroup.h
index 3f4b714ed0..a00dfea992 100644
--- a/src/newgrf_spritegroup.h
+++ b/src/newgrf_spritegroup.h
@@ -204,6 +204,7 @@ inline bool IsEvalAdjustWithZeroRemovable(DeterministicSpriteGroupAdjustOperatio
 		case DSGA_OP_SHL:
 		case DSGA_OP_SHR:
 		case DSGA_OP_SAR:
+		case DSGA_OP_UMAX:
 			return true;
 
 		default: