diff --git a/util-core/src/main/scala-2.12-/com/twitter/util/MapUtil.scala b/util-core/src/main/scala-2.12-/com/twitter/util/MapUtil.scala
new file mode 100644
index 0000000000..6e180c84be
--- /dev/null
+++ b/util-core/src/main/scala-2.12-/com/twitter/util/MapUtil.scala
@@ -0,0 +1,13 @@
+package com.twitter.util
+
+import scala.collection.mutable
+
+object MapUtil {
+
+  def newHashMap[K, V](initialCapacity: Int, loadFactor: Double = 0.75): mutable.HashMap[K, V] = {
+    new mutable.HashMap[K, V]() {
+      this._loadFactor = (loadFactor * 1000).toInt
+      override protected val initialSize: Int = (size.toLong / loadFactor).toInt
+    }
+  }
+}
diff --git a/util-core/src/main/scala-2.13+/com/twitter/util/MapUtil.scala b/util-core/src/main/scala-2.13+/com/twitter/util/MapUtil.scala
new file mode 100644
index 0000000000..2994ca876c
--- /dev/null
+++ b/util-core/src/main/scala-2.13+/com/twitter/util/MapUtil.scala
@@ -0,0 +1,10 @@
+package com.twitter.util
+
+import scala.collection.mutable
+
+object MapUtil {
+
+  def newHashMap[K, V](initialCapacity: Int, loadFactor: Double = 0.75): mutable.HashMap[K, V] = {
+    new mutable.HashMap[K, V](initialCapacity, loadFactor)
+  }
+}