diff --git a/maps.proto b/maps.proto
index c2e82c2..6a6dad6 100644
--- a/maps.proto
+++ b/maps.proto
@@ -25,14 +25,14 @@ message MapResponse {
   int64 ID = 1;
   string DisplayName = 2;
   int32 GameID = 4;
-  uint32 Thumbnail = 6;
+  uint64 Thumbnail = 6;
 }
 
 message MapRequest {
   int64 ID = 1;
   optional string DisplayName = 2;
   optional int32 GameID = 4;
-  optional uint32 Thumbnail = 6;
+  optional uint64 Thumbnail = 6;
 }
 
 message MapFilter {