diff --git a/lib/core/AxiosHeaders.js b/lib/core/AxiosHeaders.js
index fd996a3..42a10ca 100644
--- a/lib/core/AxiosHeaders.js
+++ b/lib/core/AxiosHeaders.js
@@ -249,7 +249,7 @@ class AxiosHeaders {
   }
 
   getSetCookie() {
-    return this["set-cookie"] || [];
+    return this.get("set-cookie") || [];
   }
 
   get [Symbol.toStringTag]() {