diff --git a/src/add-ons/kernel/file_systems/fat/dosfs.cpp b/src/add-ons/kernel/file_systems/fat/dosfs.cpp
index e575e13529..8a9b8267b9 100644
--- a/src/add-ons/kernel/file_systems/fat/dosfs.cpp
+++ b/src/add-ons/kernel/file_systems/fat/dosfs.cpp
@@ -909,7 +909,7 @@ update_fsinfo(nspace *vol)
 static status_t
 get_fsinfo(nspace *vol, uint32 *free_count, uint32 *last_allocated)
 {
-	char *buffer;
+	uchar *buffer;
 	status_t result;
 
 	if ((vol->fat_bits != 32) || (vol->fsinfo_sector == 0xffff))