diff --git a/src/drawing/sprite.c b/src/drawing/sprite.c
index 74ac99a29b..355204e3ba 100644
--- a/src/drawing/sprite.c
+++ b/src/drawing/sprite.c
@@ -308,7 +308,7 @@ void gfx_rle_sprite_to_buffer(uint8* source_bits_pointer, uint8* dest_bits_point
 
 			if (x_start & ~zoom_mask){
 				no_pixels -= (x_start&~zoom_mask);
-				x_start += (x_start&~zoom_mask);
+				x_start += ~zoom_mask;
 				source_pointer += (x_start&~zoom_mask);
 				if (no_pixels <= 0) continue;
 			}