diff --git a/configs/defconfig b/configs/defconfig
index eb8cafb..c0db7c3 100644
--- a/configs/defconfig
+++ b/configs/defconfig
@@ -4,3 +4,4 @@
 CONFIG_HWBASE_DYNAMIC_MMIO		=
 CONFIG_HWBASE_TIMER_CLOCK_GETTIME	= y
 CONFIG_HWBASE_TIMER_MUTIME		=
+CONFIG_HWBASE_POSIX_FILE		=