diff --git a/sdk_container/src/third_party/coreos-overlay/coreos/config/env/sys-devel/flex b/sdk_container/src/third_party/coreos-overlay/coreos/config/env/sys-devel/flex
deleted file mode 100644
index bfea8f4030..0000000000
--- a/sdk_container/src/third_party/coreos-overlay/coreos/config/env/sys-devel/flex
+++ /dev/null
@@ -1 +0,0 @@
-export EXTRA_ECONF="--disable-bootstrap"