diff --git a/tools/make-unicode-tables.js b/tools/make-unicode-tables.js
index cd75429..ea8073d 100755
--- a/tools/make-unicode-tables.js
+++ b/tools/make-unicode-tables.js
@@ -99,7 +99,7 @@ let idContinueTotalCount = 0;
 const lineRegex = /^([0-9A-F]{4,6})(?:\.\.([0-9A-F]{4,6}))? *; (\w+) #.*$/;
 
 http.get(UCD_LINK, (res) => {
-  const linereader = readline.createInterface({ input: res });
+  const linereader = readline.createInterface({ input: res, historySize: 0 });
   linereader.on('line', (line) => {
     const values = lineRegex.exec(line);
     if (values !== null) {