diff --git a/boot/bootutil/src/bootutil_misc.c b/boot/bootutil/src/bootutil_misc.c
index 4a2ab9a..90dc722 100644
--- a/boot/bootutil/src/bootutil_misc.c
+++ b/boot/bootutil/src/bootutil_misc.c
@@ -148,7 +148,7 @@
 }
 
 uint32_t
-boot_trailer_sz(uint8_t min_write_sz)
+boot_trailer_sz(uint32_t min_write_sz)
 {
     return /* state for all sectors */
            BOOT_STATUS_MAX_ENTRIES * BOOT_STATUS_STATE_COUNT * min_write_sz +
diff --git a/boot/bootutil/src/bootutil_priv.h b/boot/bootutil/src/bootutil_priv.h
index f2b5825..e701429 100644
--- a/boot/bootutil/src/bootutil_priv.h
+++ b/boot/bootutil/src/bootutil_priv.h
@@ -214,7 +214,7 @@
     } scratch;
 
     uint8_t swap_type[BOOT_IMAGE_NUMBER];
-    uint8_t write_sz;
+    uint32_t write_sz;
 
 #if defined(MCUBOOT_ENC_IMAGES)
     struct enc_key_data enc[BOOT_IMAGE_NUMBER][BOOT_NUM_SLOTS];
@@ -229,7 +229,7 @@
                         size_t slen, uint8_t key_id);
 
 int boot_magic_compatible_check(uint8_t tbl_val, uint8_t val);
-uint32_t boot_trailer_sz(uint8_t min_write_sz);
+uint32_t boot_trailer_sz(uint32_t min_write_sz);
 int boot_status_entries(int image_index, const struct flash_area *fap);
 uint32_t boot_status_off(const struct flash_area *fap);
 uint32_t boot_swap_info_off(const struct flash_area *fap);
diff --git a/boot/bootutil/src/loader.c b/boot/bootutil/src/loader.c
index 5e12891..43bc487 100644
--- a/boot/bootutil/src/loader.c
+++ b/boot/bootutil/src/loader.c
@@ -363,11 +363,11 @@
     return 0;
 }
 
-static uint8_t
+static uint32_t
 boot_write_sz(struct boot_loader_state *state)
 {
-    uint8_t elem_sz;
-    uint8_t align;
+    uint32_t elem_sz;
+    uint32_t align;
 
     /* Figure out what size to write update status update as.  The size depends
      * on what the minimum write size is for scratch area, active image slot.