diff --git a/lib/core/AxiosHeaders.js b/lib/core/AxiosHeaders.js
index 138384caf3..361d340c52 100644
--- a/lib/core/AxiosHeaders.js
+++ b/lib/core/AxiosHeaders.js
@@ -29,9 +29,7 @@ function parseTokens(str) {
   return tokens;
 }
 
-function isValidHeaderName(str) {
-  return /^[-_a-zA-Z]+$/.test(str.trim());
-}
+const isValidHeaderName = (str) => /^[-_a-zA-Z0-9^`|~,!#$%&'*+.]+$/.test(str.trim());
 
 function matchHeaderValue(context, value, header, filter, isHeaderNameFilter) {
   if (utils.isFunction(filter)) {