diff --git a/sdk_container/src/third_party/portage-stable/eclass/multiprocessing.eclass b/sdk_container/src/third_party/portage-stable/eclass/multiprocessing.eclass
index c32bfaac2e..39e81ab207 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/multiprocessing.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/multiprocessing.eclass
@@ -1,13 +1,15 @@
 # Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
+# Flatcar: Support EAPI 0 and 4.
+
 # @ECLASS: multiprocessing.eclass
 # @MAINTAINER:
 # base-system@gentoo.org
 # @AUTHOR:
 # Brian Harring <ferringb@gentoo.org>
 # Mike Frysinger <vapier@gentoo.org>
-# @SUPPORTED_EAPIS: 5 6 7 8
+# @SUPPORTED_EAPIS: 0 4 5 6 7 8
 # @BLURB: multiprocessing helper functions
 # @DESCRIPTION:
 # The multiprocessing eclass contains a suite of utility functions
@@ -25,7 +27,7 @@
 # @CODE
 
 case ${EAPI:-0} in
-	[5678]) ;;
+	[045678]) ;;
 	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
 esac