diff --git a/boot/zephyr/include/target.h b/boot/zephyr/include/target.h
index f7d2d0f..99f6361 100644
--- a/boot/zephyr/include/target.h
+++ b/boot/zephyr/include/target.h
@@ -23,6 +23,8 @@
 
 #define FLASH_ALIGN FLASH_WRITE_BLOCK_SIZE
 
+#endif /* !defined(MCUBOOT_TARGET_CONFIG) */
+
 /*
  * Sanity check the target support.
  */