diff --git a/lib/upload.js b/lib/upload.js
index 5023fb8d..edc9a82b 100644
--- a/lib/upload.js
+++ b/lib/upload.js
@@ -155,23 +155,6 @@ class BaseUpload {
       })
   }
 
-  static convertToStringHeaderValue(val) {
-    if (val === null || val === undefined) {
-      return ''
-    } else if (Array.isArray(val)) {
-      return val.join(',')
-    } else if (
-      typeof val === 'string' ||
-      typeof val === 'number' ||
-      typeof val === 'boolean' ||
-      typeof val === 'symbol'
-    ) {
-      return val.toString()
-    } else if (typeof val === 'object') {
-      return Object.values(val).join(',')
-    }
-  }
-
   findPreviousUploads() {
     return this.options
       .fingerprint(this.file, this.options)
@@ -395,7 +378,7 @@ class BaseUpload {
         // Add metadata if values have been added
         const metadata = encodeMetadata(this.options.metadata)
         if (metadata !== '') {
-          req.setHeader('Upload-Metadata', BaseUpload.convertToStringHeaderValue(metadata))
+          req.setHeader('Upload-Metadata', metadata)
         }
 
         return this._sendRequest(req, null)
@@ -598,13 +581,13 @@ class BaseUpload {
     if (this.options.uploadLengthDeferred) {
       req.setHeader('Upload-Defer-Length', '1')
     } else {
-      req.setHeader('Upload-Length', BaseUpload.convertToStringHeaderValue(this._size))
+      req.setHeader('Upload-Length',`${this._size}`))
     }
 
     // Add metadata if values have been added
     const metadata = encodeMetadata(this.options.metadata)
     if (metadata !== '') {
-      req.setHeader('Upload-Metadata', BaseUpload.convertToStringHeaderValue(metadata))
+      req.setHeader('Upload-Metadata', metadata)
     }
 
     let promise
@@ -771,7 +754,7 @@ class BaseUpload {
       req = this._openRequest('PATCH', this.url)
     }
 
-    req.setHeader('Upload-Offset', BaseUpload.convertToStringHeaderValue(this._offset))
+    req.setHeader('Upload-Offset', `${this._offset}`)
     const promise = this._addChunkToRequest(req)
 
     promise
@@ -827,7 +810,7 @@ class BaseUpload {
       // upload size and can tell the tus server.
       if (this.options.uploadLengthDeferred && done) {
         this._size = this._offset + valueSize
-        req.setHeader('Upload-Length', BaseUpload.convertToStringHeaderValue(this._size))
+        req.setHeader('Upload-Length', `${this._size}`)
       }
 
       // The specified uploadSize might not match the actual amount of data that a source
@@ -990,7 +973,7 @@ function openRequest(method, url, options) {
   const headers = options.headers || {}
 
   for (const [name, value] of Object.entries(headers)) {
-    req.setHeader(name, BaseUpload.convertToStringHeaderValue(value))
+    req.setHeader(name, value)
   }
 
   if (options.addRequestId) {