diff --git a/kv/mdbx/kv_mdbx.go b/kv/mdbx/kv_mdbx.go
index 0876c195c..a5f9489d0 100644
--- a/kv/mdbx/kv_mdbx.go
+++ b/kv/mdbx/kv_mdbx.go
@@ -206,9 +206,9 @@ func (opts MdbxOpts) Open() (kv.RwDB, error) {
 		}
 		// must be in the range from 12.5% (almost empty) to 50% (half empty)
 		// which corresponds to the range from 8192 and to 32768 in units respectively
-		//if err = env.SetOption(mdbx.OptMergeThreshold16dot16Percent, 32768); err != nil {
-		//	return nil, err
-		//}
+		if err = env.SetOption(mdbx.OptMergeThreshold16dot16Percent, 32768); err != nil {
+			return nil, err
+		}
 	}
 
 	dirtyPagesLimit, err := env.GetOption(mdbx.OptTxnDpLimit)