diff --git a/cloud/blockstore/config/disk.proto b/cloud/blockstore/config/disk.proto
index 09d5ffffc1..cc290743ea 100644
--- a/cloud/blockstore/config/disk.proto
+++ b/cloud/blockstore/config/disk.proto
@@ -297,7 +297,7 @@ message TDiskAgentConfig
 
     // If enabled, IOParserActor allocates a storage buffer and copies the
     // request data into it.
-    optional uint32 IOParserActorAllocateStorageEnabled = 39;
+    optional bool IOParserActorAllocateStorageEnabled = 39;
 }
 
 ////////////////////////////////////////////////////////////////////////////////