diff --git a/bin/compose-core b/bin/compose-core
index f500bae..cb14a97 100755
--- a/bin/compose-core
+++ b/bin/compose-core
@@ -1272,19 +1272,22 @@ run_service_hook () {
             charm.has_hook "$charm" "$action" >/dev/null || continue
 
             PROJECT_NAME=$(get_default_project_name) || return 1
-            export MASTER_BASE_SERVICE_NAME=$(get_top_master_service_for_service "$subservice") || return 1
-            export MASTER_BASE_CHARM_NAME=$(get_service_charm "$MASTER_BASE_SERVICE_NAME") || return 1
+            MASTER_BASE_SERVICE_NAME=$(get_top_master_service_for_service "$subservice") || return 1
+            MASTER_BASE_CHARM_NAME=$(get_service_charm "$MASTER_BASE_SERVICE_NAME") || return 1
+            DOCKER_BASE_IMAGE=$(service_base_docker_image "$MASTER_BASE_SERVICE_NAME") || return 1
 
             Wrap -d "running $YELLOW$action$NORMAL hook of $DARKYELLOW$subservice$NORMAL in charm $DARKPINK$charm$NORMAL" <<EOF || return 1
 
+            export DOCKER_BASE_IMAGE="$DOCKER_BASE_IMAGE"
             export SERVICE_NAME=$subservice
             export IMAGE_NAME=$(echo "${PROJECT_NAME}" | tr -d "_-")_\${SERVICE_NAME}
             export CONTAINER_NAME=\${IMAGE_NAME}_1
             export CHARM_NAME="$charm"
-            export PROJECT_NAME=$PROJECT_NAME
-            export DOCKER_BASE_IMAGE=$(service_base_docker_image "$MASTER_BASE_SERVICE_NAME")
+            export PROJECT_NAME="$PROJECT_NAME"
             export SERVICE_DATASTORE="$DATASTORE/$subservice"
             export SERVICE_CONFIGSTORE="$CONFIGSTORE/$subservice"
+            export MASTER_BASE_SERVICE_NAME="$MASTER_BASE_SERVICE_NAME"
+            export MASTER_BASE_CHARM_NAME="$MASTER_BASE_CHARM_NAME"
 
             charm.run_hook "$charm" "$action"