diff --git a/configs/yellowstone_defconfig b/configs/yellowstone_defconfig
index 7b1a630..805d359 100644
--- a/configs/yellowstone_defconfig
+++ b/configs/yellowstone_defconfig
@@ -2,3 +2,4 @@
 CONFIG_4xx=y
 CONFIG_TARGET_YOSEMITE=y
 CONFIG_SYS_EXTRA_OPTIONS="YELLOWSTONE"
+CONFIG_CMD_SETEXPR=y