diff --git a/subsys/storage/flash_map/flash_map.c b/subsys/storage/flash_map/flash_map.c
index 45e9b9e3085..5a7606d36ee 100644
--- a/subsys/storage/flash_map/flash_map.c
+++ b/subsys/storage/flash_map/flash_map.c
@@ -40,7 +40,7 @@ static const struct driver_map_entry  flash_drivers_map[] = {
 #endif
 };
 
-const struct flash_area *flash_map;
+extern const struct flash_area *flash_map;
 extern const int flash_map_entries;
 static struct device *flash_dev[ARRAY_SIZE(flash_drivers_map)];