diff --git a/samples/mcuboot_config/mcuboot_config.template.h b/samples/mcuboot_config/mcuboot_config.template.h
index e5f208c..75ec500 100644
--- a/samples/mcuboot_config/mcuboot_config.template.h
+++ b/samples/mcuboot_config/mcuboot_config.template.h
@@ -78,4 +78,8 @@
  * See the flash APIs for more details. */
 /* #define MCUBOOT_USE_FLASH_AREA_GET_SECTORS */
 
+/* Default maximum number of flash sectors per image slot; change
+ * as desirable. */
+#define MCUBOOT_MAX_IMG_SECTORS 128
+
 #endif /* __MCUBOOT_CONFIG_H__ */