diff --git a/src/utils/parseHeaders.js b/src/utils/parseHeaders.js
index 53ab29f6a..04e9ad3e5 100644
--- a/src/utils/parseHeaders.js
+++ b/src/utils/parseHeaders.js
@@ -8,7 +8,7 @@ export default function parseHeaders(rawHeaders) {
     return null
   }
 
-  const unflattened = unflat(rawHeaders, 2)
+  const unflattened = unflat(rawHeaders)
 
   return fromEntries(unflattened)
 }
diff --git a/src/utils/parseMultiValueHeaders.js b/src/utils/parseMultiValueHeaders.js
index fa02fabf2..f8b5721cc 100644
--- a/src/utils/parseMultiValueHeaders.js
+++ b/src/utils/parseMultiValueHeaders.js
@@ -10,7 +10,7 @@ export default function parseMultiValueHeaders(rawHeaders) {
   }
 
   const map = new Map()
-  const unflattened = unflat(rawHeaders, 2)
+  const unflattened = unflat(rawHeaders)
 
   // eslint-disable-next-line no-restricted-syntax
   for (const [key, value] of unflattened) {