diff --git a/src/thrift.js b/src/thrift.js
index 5720c81..45e9b4a 100644
--- a/src/thrift.js
+++ b/src/thrift.js
@@ -229,24 +229,3 @@ function readCollectionBegin(reader) {
   }
   return [type, size]
 }
-
-/**
- * Convert int to varint. Outputs 1-5 bytes for int32.
- *
- * @param {number} n
- * @returns {number[]}
- */
-export function toVarInt(n) {
-  let idx = 0
-  const varInt = []
-  while (true) {
-    if ((n & ~0x7f) === 0) {
-      varInt[idx++] = n
-      break
-    } else {
-      varInt[idx++] = n & 0x7f | 0x80
-      n >>>= 7
-    }
-  }
-  return varInt
-}
diff --git a/test/thrift.test.js b/test/thrift.test.js
index d43377e..68b9604 100644
--- a/test/thrift.test.js
+++ b/test/thrift.test.js
@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { deserializeTCompactProtocol, readVarInt, toVarInt } from '../src/thrift.js'
+import { deserializeTCompactProtocol, readVarInt } from '../src/thrift.js'
 import { reader } from './helpers.js'
 
 describe('deserializeTCompactProtocol function', () => {
@@ -113,3 +113,24 @@ describe('readVarInt', () => {
     expect(readVarInt(reader([0xff, 0xff, 0xff, 0xff, 0x07]))).toBe(2147483647)
   })
 })
+
+/**
+ * Convert int to varint. Outputs 1-5 bytes for int32.
+ *
+ * @param {number} n
+ * @returns {number[]}
+ */
+function toVarInt(n) {
+  let idx = 0
+  const varInt = []
+  while (true) {
+    if ((n & ~0x7f) === 0) {
+      varInt[idx++] = n
+      break
+    } else {
+      varInt[idx++] = n & 0x7f | 0x80
+      n >>>= 7
+    }
+  }
+  return varInt
+}