diff --git a/envoy/extensions/key_value/file_based/v3/config.proto b/envoy/extensions/key_value/file_based/v3/config.proto
index 49873f73..a07de903 100644
--- a/envoy/extensions/key_value/file_based/v3/config.proto
+++ b/envoy/extensions/key_value/file_based/v3/config.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package envoy.extensions.key_value.file_based.v3;
 
 import "google/protobuf/duration.proto";
+import "google/protobuf/wrappers.proto";
 
 import "xds/annotations/v3/status.proto";
 
@@ -28,4 +29,8 @@ message FileBasedKeyValueStoreConfig {
 
   // The interval at which the key value store should be flushed to the file.
   google.protobuf.Duration flush_interval = 2;
+
+  // The maximum number of entries to cache, or 0 to allow for unlimited entries.
+  // Defaults to 1000 if not present.
+  google.protobuf.UInt32Value max_entries = 3;
 }