1 files changed, 5 insertions, 4 deletions
diff --git a/dom/fetch/InternalHeaders.cpp b/dom/fetch/InternalHeaders.cpp
index 11585615ea..83a6867851 100644
--- a/dom/fetch/InternalHeaders.cpp
+++ b/dom/fetch/InternalHeaders.cpp
@@ -316,10 +316,11 @@ InternalHeaders::Fill(const Sequence<Sequence<nsCString>>& aInit, ErrorResult& a
 void
 InternalHeaders::Fill(const MozMap<nsCString>& aInit, ErrorResult& aRv)
 {
-  nsTArray<nsString> keys;
-  aInit.GetKeys(keys);
-  for (uint32_t i = 0; i < keys.Length() && !aRv.Failed(); ++i) {
-    Append(NS_ConvertUTF16toUTF8(keys[i]), aInit.Get(keys[i]), aRv);
+  for (auto& entry : aInit.Entries()) {
+    Append(NS_ConvertUTF16toUTF8(entry.mKey), entry.mValue, aRv);
+    if (aRv.Failed()) {
+      return;
+    }
   }
 }