diff --git a/api-reports/2_12.txt b/api-reports/2_12.txt
index 4a975c2a0..7d355e6ca 100644
--- a/api-reports/2_12.txt
+++ b/api-reports/2_12.txt
@@ -252,7 +252,7 @@ experimental/Fullscreen.FullscreenDocument[JT] var onfullscreenerror: js.Functio
 experimental/Fullscreen.FullscreenElement[JT] def requestFullscreen(): js.UndefOr[js.Promise[Unit]]
 experimental/Headers[JC] def append(name: ByteString, value: ByteString): Unit
 experimental/Headers[JC] def delete(name: ByteString): Unit
-experimental/Headers[JC] def get(name: ByteString): js.UndefOr[ByteString]
+experimental/Headers[JC] def get(name: ByteString): ByteString
 experimental/Headers[JC] def getAll(name: ByteString): Sequence[ByteString]
 experimental/Headers[JC] def has(name: ByteString): Boolean
 experimental/Headers[JC] @JSName(js.Symbol.iterator) def jsIterator(): js.Iterator[js.Array[ByteString]]
diff --git a/api-reports/2_13.txt b/api-reports/2_13.txt
index c2030e587..db3e6f27f 100644
--- a/api-reports/2_13.txt
+++ b/api-reports/2_13.txt
@@ -252,7 +252,7 @@ experimental/Fullscreen.FullscreenDocument[JT] var onfullscreenerror: js.Functio
 experimental/Fullscreen.FullscreenElement[JT] def requestFullscreen(): js.UndefOr[js.Promise[Unit]]
 experimental/Headers[JC] def append(name: ByteString, value: ByteString): Unit
 experimental/Headers[JC] def delete(name: ByteString): Unit
-experimental/Headers[JC] def get(name: ByteString): js.UndefOr[ByteString]
+experimental/Headers[JC] def get(name: ByteString): ByteString
 experimental/Headers[JC] def getAll(name: ByteString): Sequence[ByteString]
 experimental/Headers[JC] def has(name: ByteString): Boolean
 experimental/Headers[JC] @JSName(js.Symbol.iterator) def jsIterator(): js.Iterator[js.Array[ByteString]]
diff --git a/src/main/scala/org/scalajs/dom/experimental/Fetch.scala b/src/main/scala/org/scalajs/dom/experimental/Fetch.scala
index 42064db9c..c05457f48 100644
--- a/src/main/scala/org/scalajs/dom/experimental/Fetch.scala
+++ b/src/main/scala/org/scalajs/dom/experimental/Fetch.scala
@@ -309,7 +309,7 @@ class Headers(map: HeadersInit = js.Array[js.Array[String]]())
    *
    * @param name a ByteString, ie. only ASCII chars
    */
-  def get(name: ByteString): js.UndefOr[ByteString] = js.native
+  def get(name: ByteString): ByteString = js.native
 
   /**
    * The getAll() method of the Headers interface returns an array of all the