diff --git a/kv/mdbx/kv_mdbx.go b/kv/mdbx/kv_mdbx.go
index c11c470a9..490aca468 100644
--- a/kv/mdbx/kv_mdbx.go
+++ b/kv/mdbx/kv_mdbx.go
@@ -129,7 +129,7 @@ func (opts MdbxOpts) InMem(tmpDir string) MdbxOpts {
 	}
 	opts.path = path
 	opts.inMem = true
-	opts.flags = mdbx.UtterlyNoSync | mdbx.NoMetaSync | mdbx.LifoReclaim | mdbx.WriteMap | mdbx.NoMemInit
+	opts.flags = mdbx.UtterlyNoSync | mdbx.NoMetaSync | mdbx.LifoReclaim | mdbx.NoMemInit
 	opts.mapSize = 512 * datasize.MB
 	return opts
 }