diff --git a/build_packages b/build_packages
index 4fd060e..b824167 100755
--- a/build_packages
+++ b/build_packages
@@ -36,9 +36,6 @@
   "Define the file that event logs will be written."
 DEFINE_boolean withrevdeps "${FLAGS_TRUE}" \
   "Calculate reverse dependencies on changed ebuilds."
-# Temporarily keep this flag until removed from rest of build system.
-DEFINE_string save_install_plan "" \
-  "Save install plan filename for correct reverse dependency calculation."
 
 # The --board_root flag specifies the environment variables ROOT and PKGDIR.
 # This allows fetching and emerging of all packages to specified board_root.
diff --git a/setup_board b/setup_board
index f403188..419fc8f 100755
--- a/setup_board
+++ b/setup_board
@@ -61,8 +61,6 @@
   "Don't emerge any packages during setup_board into the board root."
 DEFINE_string board_root "" \
   "Board root."
-DEFINE_string save_install_plan "" \
-  "Save install plan to filename for correct reverse dependency calculation."
 
 # The --reuse_pkgs_from_local_boards flag tells Portage to share binary
 # packages between boards that are built locally, so that the total time
@@ -99,11 +97,6 @@
 if [[ "${FLAGS_skip_toolchain_update}" -eq "${FLAGS_TRUE}" ]]; then
   UPDATE_ARGS+=" --skip_toolchain_update"
 fi
-if [[ ! -z "${FLAGS_save_install_plan}" ]]; then
-  # If we are trying to calculate reverse dependencies pass the install
-  # plan filename to update_chroot.
-  UPDATE_ARGS+=" --save_install_plan=${FLAGS_save_install_plan}"
-fi
 
 if [ "${FLAGS_skip_chroot_upgrade}" -eq "${FLAGS_FALSE}" ] ; then
   "${SRC_ROOT}/scripts"/update_chroot ${UPDATE_ARGS}
diff --git a/update_chroot b/update_chroot
index 00ba389..19ddadd 100755
--- a/update_chroot
+++ b/update_chroot
@@ -34,8 +34,6 @@
   "Extra toolchains to setup for the specified boards."
 DEFINE_boolean eclean ${FLAGS_TRUE} \
   "Run eclean to delete old binpkgs after updating the chroot."
-DEFINE_string save_install_plan "" \
-  "Save install plan to filename for correct reverse dependency calculation."
 
 # Parse command line flags
 FLAGS "$@" || exit 1
@@ -116,12 +114,6 @@
     $(printf ' --useoldpkg-atoms=%s' "${PACKAGES[@]}")
   )
 fi
-SAVE_INSTALL_PLAN_FLAGS=()
-if [[ ! -z "${FLAGS_save_install_plan}" ]]; then
-  SAVE_INSTALL_PLAN_FLAGS=(
-    $(printf ' --install-plan-filename=%s' "${FLAGS_save_install_plan}") )
-  EMERGE_FLAGS+=( ${SAVE_INSTALL_PLAN_FLAGS[@]} )
-fi
 if [[ "${FLAGS_jobs}" -ne -1 ]]; then
   EMERGE_FLAGS+=( --jobs="${FLAGS_jobs}" )
 fi
@@ -142,7 +134,6 @@
   EMERGE_FLAGS+=(
     $("${CHROMITE_BIN}/cros_setup_toolchains" --show-packages host-post-cross)
   )
-  EMERGE_FLAGS+=( ${SAVE_INSTALL_PLAN_FLAGS[@]} )
   sudo -E ${EMERGE_CMD} "${EMERGE_FLAGS[@]}"
 fi