diff --git a/src/spriteloader/grf.cpp b/src/spriteloader/grf.cpp
index e1e79e57bd..4bf75d2c57 100644
--- a/src/spriteloader/grf.cpp
+++ b/src/spriteloader/grf.cpp
@@ -66,7 +66,8 @@ bool DecodeSingleSprite(SpriteLoader::Sprite *sprite, SpriteFile &file, size_t f
 	 *
 	 * So, any sprite data more than 64 MiB is way larger that we would even expect; prevent allocating more memory!
 	 */
-	if (num < 0 || num > 64 * 1024 * 1024) return WarnCorruptSprite(file, file_pos, __LINE__);
+	constexpr int64 MAX_SPRITE_SIZE = 64 * 1024 * 1024;
+	if (num < 0 || num > MAX_SPRITE_SIZE) return WarnCorruptSprite(file, file_pos, __LINE__);
 
 	std::unique_ptr<byte[]> dest_orig(new byte[num]);
 	byte *dest = dest_orig.get();
@@ -207,7 +208,6 @@ bool DecodeSingleSprite(SpriteLoader::Sprite *sprite, SpriteFile &file, size_t f
 				}
 				/* Magic blue. */
 				if (colour_fmt == SCC_PAL && *pixel == 0) sprite->data[i].a = 0x00;
-				pixel++;
 			}
 		}
 	}