Index: uspace/srv/fs/fat/fat_fat.c
===================================================================
--- uspace/srv/fs/fat/fat_fat.c	(revision efa8ed93920e4065d49fd3ee204246729808c9eb)
+++ uspace/srv/fs/fat/fat_fat.c	(revision d9637426c5abea61ce3d9deac46768f90573616f)
@@ -82,7 +82,7 @@
 int
 fat_cluster_walk(fat_bs_t *bs, devmap_handle_t devmap_handle, fat_cluster_t firstc,
-    fat_cluster_t *lastc, uint16_t *numc, uint16_t max_clusters)
-{
-	uint16_t clusters = 0;
+    fat_cluster_t *lastc, uint32_t *numc, uint32_t max_clusters)
+{
+	uint32_t clusters = 0;
 	fat_cluster_t clst = firstc, clst_last1 = FAT_CLST_LAST1(bs);
 	fat_cluster_t clst_bad = FAT_CLST_BAD(bs);
@@ -199,6 +199,6 @@
     fat_cluster_t fcl, fat_cluster_t *clp, aoff64_t bn, int flags)
 {
-	uint16_t clusters;
-	unsigned max_clusters;
+	uint32_t clusters;
+	uint32_t max_clusters;
 	fat_cluster_t c;
 	int rc;