--- a/make/autoconf/version-numbers	Wed Dec 20 17:36:50 2017 +0100
+++ b/make/autoconf/version-numbers	Wed Dec 20 09:14:06 2017 -0800
@@ -30,6 +30,8 @@
 DEFAULT_VERSION_UPDATE=0
 DEFAULT_VERSION_PATCH=0
 DEFAULT_VERSION_DATE=2018-03-20
+DEFAULT_VERSION_CLASSFILE_MAJOR=55  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
+DEFAULT_VERSION_CLASSFILE_MINOR=0
 
 LAUNCHER_NAME=openjdk
 PRODUCT_NAME=OpenJDK