diff --git a/source/arm11/open_agb_firm.c b/source/arm11/open_agb_firm.c
index 2f73737..61c2a88 100644
--- a/source/arm11/open_agb_firm.c
+++ b/source/arm11/open_agb_firm.c
@@ -273,7 +273,7 @@ atp_error_t oaf_config_page()
 }
 
 // cache the savetype
-static u16 from_savetype_cache( const char *file )
+static u16 from_savetype_cache( char file[512] )
 {
 	FILINFO fi;
 	int len = strlen( file );
@@ -296,7 +296,7 @@ static u16 from_savetype_cache( const char *file )
 	file[len-3] = 'g';
 	return retval;
 }
-static void savetype_cache_store( const char *file, u16 savetype )
+static void savetype_cache_store( char file[512], u16 savetype )
 {
 	int len = strlen( file );
 	file[len-1] = 'c';