diff --git a/src/fileio_func.h b/src/fileio_func.h
--- a/src/fileio_func.h
+++ b/src/fileio_func.h
@@ -23,10 +23,10 @@ byte FioReadByte();
 uint16 FioReadWord();
 uint32 FioReadDword();
 void FioCloseAll();
-void FioOpenFile(int slot, const std::string &filename, Subdirectory subdir);
+class SpriteFile &FioOpenFile(int slot, const std::string &filename, Subdirectory subdir, bool palette_remap = false);
 void FioReadBlock(void *ptr, size_t size);
 void FioSkipBytes(int n);
-class RandomAccessFile *FioGetRandomAccessFile(int slot);
+class SpriteFile *FioGetSpriteFile(int slot);
 
 void FioFCloseFile(FILE *f);
 FILE *FioFOpenFile(const std::string &filename, const char *mode, Subdirectory subdir, size_t *filesize = nullptr);