diff --git a/include/storage/flash_map.h b/include/storage/flash_map.h
index 48462f46ae0..dda7f78a513 100644
--- a/include/storage/flash_map.h
+++ b/include/storage/flash_map.h
@@ -191,7 +191,7 @@ int flash_area_erase(const struct flash_area *fa, off_t off, size_t len);
  *
  * @return Alignment restriction for flash writes in [B].
  */
-uint8_t flash_area_align(const struct flash_area *fa);
+uint32_t flash_area_align(const struct flash_area *fa);
 
 /**
  * Retrieve info about sectors within the area.
diff --git a/subsys/storage/flash_map/flash_map.c b/subsys/storage/flash_map/flash_map.c
index d17d994b63d..ac761088f7b 100644
--- a/subsys/storage/flash_map/flash_map.c
+++ b/subsys/storage/flash_map/flash_map.c
@@ -93,7 +93,7 @@ int flash_area_erase(const struct flash_area *fa, off_t off, size_t len)
 	return rc;
 }
 
-uint8_t flash_area_align(const struct flash_area *fa)
+uint32_t flash_area_align(const struct flash_area *fa)
 {
 	const struct device *dev;