diff --git a/AK/Concepts.h b/AK/Concepts.h
index e6a7be77c44..3dda34c887f 100644
--- a/AK/Concepts.h
+++ b/AK/Concepts.h
@@ -126,7 +126,7 @@ template<typename T, typename ValueT>
 concept IterableContainerOf = IterableContainer<T> && requires {
     {
         *declval<T>().begin()
-    } -> SameAs<ValueT>;
+    } -> SameAs<ValueT&>;
 };
 
 template<typename Func, typename... Args>
diff --git a/AK/JsonArray.h b/AK/JsonArray.h
index bd0106d1b31..58a524b3f44 100644
--- a/AK/JsonArray.h
+++ b/AK/JsonArray.h
@@ -38,12 +38,19 @@ public:
     }
 
     template<IterableContainerOf<JsonValue> ContainerT>
-    JsonArray(ContainerT const& source)
+    JsonArray(ContainerT&& source)
     {
         for (auto& value : source)
             m_values.append(move(value));
     }
 
+    template<IterableContainerOf<JsonValue> ContainerT>
+    JsonArray(ContainerT const& source)
+    {
+        for (auto const& value : source)
+            m_values.append(value);
+    }
+
     JsonArray& operator=(JsonArray const& other)
     {
         if (this != &other)