diff --git a/src/samples/demo/zephyr/boards/b_u585i_iot02a.overlay b/src/samples/demo/zephyr/boards/b_u585i_iot02a.overlay
index f9e7931e..05b518f2 100644
--- a/src/samples/demo/zephyr/boards/b_u585i_iot02a.overlay
+++ b/src/samples/demo/zephyr/boards/b_u585i_iot02a.overlay
@@ -33,7 +33,7 @@
 
             /* Use the first partition from flash. */
             storage_partition: partition@0 {
-                reg = <0x0 DT_SIZE_M(64)>;
+                reg = <0x0 DT_SIZE_M(16)>;
             };
         };
     };