diff --git a/api-reports/2_12.txt b/api-reports/2_12.txt
index 7cc217fa3..8a85ec737 100644
--- a/api-reports/2_12.txt
+++ b/api-reports/2_12.txt
@@ -1856,6 +1856,7 @@ EventSource[JC] def withCredentials: Boolean
 EventSource[JO] val CLOSED: Int
 EventSource[JO] val CONNECTING: Int
 EventSource[JO] val OPEN: Int
+EventSourceInit[JT] var withCredentials: js.UndefOr[Boolean]
 EventTarget[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 EventTarget[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 EventTarget[JC] def dispatchEvent(evt: Event): Boolean
diff --git a/api-reports/2_13.txt b/api-reports/2_13.txt
index 7cc217fa3..8a85ec737 100644
--- a/api-reports/2_13.txt
+++ b/api-reports/2_13.txt
@@ -1856,6 +1856,7 @@ EventSource[JC] def withCredentials: Boolean
 EventSource[JO] val CLOSED: Int
 EventSource[JO] val CONNECTING: Int
 EventSource[JO] val OPEN: Int
+EventSourceInit[JT] var withCredentials: js.UndefOr[Boolean]
 EventTarget[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], options: EventListenerOptions): Unit
 EventTarget[JC] def addEventListener[T <: Event](`type`: String, listener: js.Function1[T, _], useCapture: Boolean?): Unit
 EventTarget[JC] def dispatchEvent(evt: Event): Boolean
diff --git a/dom/src/main/scala/org/scalajs/dom/EventSource.scala b/dom/src/main/scala/org/scalajs/dom/EventSource.scala
index 2d299f245..f1df885af 100644
--- a/dom/src/main/scala/org/scalajs/dom/EventSource.scala
+++ b/dom/src/main/scala/org/scalajs/dom/EventSource.scala
@@ -18,7 +18,9 @@ import scala.scalajs.js.annotation._
   */
 @js.native
 @JSGlobal
-class EventSource(URL: String, settings: js.Dynamic = null) extends EventTarget {
+class EventSource private[this] extends EventTarget {
+
+  def this(url: String, configuration: EventSourceInit = js.native) = this()
 
   /** The url attribute must return the absolute URL that resulted from resolving the value that was passed to the
     * constructor. W3C 2012
diff --git a/dom/src/main/scala/org/scalajs/dom/EventSourceInit.scala b/dom/src/main/scala/org/scalajs/dom/EventSourceInit.scala
new file mode 100644
index 000000000..f73c677f3
--- /dev/null
+++ b/dom/src/main/scala/org/scalajs/dom/EventSourceInit.scala
@@ -0,0 +1,16 @@
+/** All documentation for facades is thanks to Mozilla Contributors at https://developer.mozilla.org/en-US/docs/Web/API
+  * and available under the Creative Commons Attribution-ShareAlike v2.5 or later.
+  * http://creativecommons.org/licenses/by-sa/2.5/
+  *
+  * Everything else is under the MIT License http://opensource.org/licenses/MIT
+  */
+package org.scalajs.dom
+
+import scala.scalajs.js
+
+/** Provides options to configure the new connection. */
+trait EventSourceInit extends js.Object {
+
+  /** defaulting to false, indicating if CORS should be set to include credentials */
+  var withCredentials: js.UndefOr[Boolean] = js.undefined
+}