diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 5a536f703a833a23aa358e5b157c993644e1f87e..4378d5e923ca25e55ed229b6dc106f1ceb834d85 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -628,7 +628,7 @@ config DEBUG_BLOCK_EXT_DEVT
         bool "Force extended block device numbers and spread them"
 	depends on DEBUG_KERNEL
 	depends on BLOCK
-	default y
+	default n
 	help
 	  Conventionally, block device numbers are allocated from
 	  predetermined contiguous area.  However, extended block area