diff --git a/scripts/test_downgrade_from_tag.sh b/scripts/test_downgrade_from_tag.sh
index 3416983ee..78b9fc1f6 100644
--- a/scripts/test_downgrade_from_tag.sh
+++ b/scripts/test_downgrade_from_tag.sh
@@ -20,6 +20,9 @@ DO_CLEANUP=${DO_CLEANUP:-true}
 PGOPTS="-v TEST_VERSION=${TEST_VERSION} -v TEST_REPAIR=${TEST_REPAIR} -v WITH_SUPERUSER=${WITH_SUPERUSER} -v WITH_ROLES=true -v WITH_CHUNK=true"
 GENERATE_DOWNGRADE_SCRIPT=${GENERATE_DOWNGRADE_SCRIPT:-ON}
 
+# The following variables are exported to called scripts.
+export GENERATE_DOWNGRADE_SCRIPT PG_VERSION
+
 # PID of the current shell
 PID=$$