diff --git a/src/loading/cloud.rs b/src/loading/cloud.rs
index b473773..d4ed6a0 100644
--- a/src/loading/cloud.rs
+++ b/src/loading/cloud.rs
@@ -52,6 +52,8 @@ pub(crate) struct Auth {
     pub(crate) username: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub(crate) user_domain_name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub(crate) user_id: Option<String>,
 }
 
 /// Cloud configuration.
diff --git a/src/loading/env.rs b/src/loading/env.rs
index d4dffef..e03f139 100644
--- a/src/loading/env.rs
+++ b/src/loading/env.rs
@@ -50,6 +50,7 @@ fn _from_env<E: Environment>(env: E) -> Result<CloudConfig, Error> {
         token: env.get("OS_TOKEN").ok(),
         username: env.get("OS_USERNAME").ok(),
         user_domain_name: env.get("OS_USER_DOMAIN_NAME").ok(),
+        user_id: env.get("OS_USER_ID").ok(),
     };
 
     let config = CloudConfig {