diff --git a/lib/tempest b/lib/tempest
index 6afed0eaf1..4a192a0790 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -636,6 +636,9 @@ function configure_tempest {
         # Remove disabled extensions
         network_api_extensions=$(remove_disabled_extensions $network_api_extensions $DISABLE_NETWORK_API_EXTENSIONS)
     fi
+    if [[ -n "$ADDITIONAL_NETWORK_API_EXTENSIONS" ]] && [[ "$network_api_extensions" != "all" ]]; then
+        network_api_extensions+=",$ADDITIONAL_NETWORK_API_EXTENSIONS"
+    fi
     iniset $TEMPEST_CONFIG network-feature-enabled api_extensions $network_api_extensions
     # Swift API Extensions
     local object_storage_api_extensions=${OBJECT_STORAGE_API_EXTENSIONS:-"all"}