diff --git a/modal_proto/api.proto b/modal_proto/api.proto
index ebb70d3de..d407c0618 100644
--- a/modal_proto/api.proto
+++ b/modal_proto/api.proto
@@ -1828,6 +1828,7 @@ message SandboxInfo {
 message SandboxListRequest {
   string app_id = 1;
   double before_timestamp = 2;
+  string environment_name = 3;
 }
 
 message SandboxListResponse {