diff --git a/crates/openshell-sdk/src/client.rs b/crates/openshell-sdk/src/client.rs
index 20c84d4654..e0f9077cf6 100644
--- a/crates/openshell-sdk/src/client.rs
+++ b/crates/openshell-sdk/src/client.rs
@@ -468,6 +468,7 @@ fn create_sandbox_request(spec: SandboxSpec) -> proto::CreateSandboxRequest {
         }),
         name: name.unwrap_or_default(),
         labels,
+        annotations: std::collections::HashMap::new(),
     }
 }
 
diff --git a/crates/openshell-sdk/tests/client_mock.rs b/crates/openshell-sdk/tests/client_mock.rs
index 4a5c59dca8..cdd4a0b523 100644
--- a/crates/openshell-sdk/tests/client_mock.rs
+++ b/crates/openshell-sdk/tests/client_mock.rs
@@ -55,6 +55,7 @@ fn sandbox_with_phase(name: &str, phase: proto::SandboxPhase) -> proto::Sandbox
             created_at_ms: 0,
             labels: HashMap::new(),
             resource_version: 1,
+            annotations: HashMap::new(),
         }),
         spec: None,
         status: Some(proto::SandboxStatus {