diff --git a/build_image.sh b/build_image.sh
index 8f1125870c..0ce4fd7a8e 100755
--- a/build_image.sh
+++ b/build_image.sh
@@ -210,6 +210,7 @@ SERVER="$MIRROR_INSIDE"
 SUITE="$FLAGS_suite"
 SERVER2="$MIRROR2_INSIDE"
 SUITE2="$FLAGS_suite2"
+CHROMEOS_OFFICIAL="$CHROMEOS_OFFICIAL"
 EOF
 # Also export ChromeOS version strings
 set | grep "CHROMEOS_VERSION" >> $CUST_OPTS