diff --git a/mfbt/HashTable.h b/mfbt/HashTable.h
index 116d17f6870b..c1fc716ffec5 100644
--- a/mfbt/HashTable.h
+++ b/mfbt/HashTable.h
@@ -248,7 +248,14 @@ class HashMap {
   // false on OOM.
   template <typename KeyInput, typename ValueInput>
   [[nodiscard]] bool put(KeyInput&& aKey, ValueInput&& aValue) {
-    AddPtr p = lookupForAdd(aKey);
+    return put(aKey, std::forward<KeyInput>(aKey),
+               std::forward<ValueInput>(aValue));
+  }
+
+  template <typename KeyInput, typename ValueInput>
+  [[nodiscard]] bool put(const Lookup& aLookup, KeyInput&& aKey,
+                         ValueInput&& aValue) {
+    AddPtr p = lookupForAdd(aLookup);
     if (p) {
       p->value() = std::forward<ValueInput>(aValue);
       return true;