diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index f010336..7b98f1c 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,18 @@
+2017-09-20  Daniel Bates  <dabates@apple.com>
+
+        RenderedDocumentMarker.h should include DocumentMarker.h
+        https://bugs.webkit.org/show_bug.cgi?id=177263
+
+        Reviewed by Andy Estes.
+
+        RenderedDocumentMarker extends DocumentMarker. RenderedDocumentMarker.h should
+        include DocumentMarker.h. Otherwise, both DocumentMarker.h and RenderedDocumentMarker.h
+        must be explicitly included.
+
+        * dom/RenderedDocumentMarker.h:
+        * rendering/RenderText.cpp:
+        * testing/Internals.cpp:
+
 2017-09-20  Alex Christensen  <achristensen@webkit.org>
 
         Clean up content extensions code in preparation for more actions with string arguments
diff --git a/Source/WebCore/dom/RenderedDocumentMarker.h b/Source/WebCore/dom/RenderedDocumentMarker.h
index e212ecc..89e6493 100644
--- a/Source/WebCore/dom/RenderedDocumentMarker.h
+++ b/Source/WebCore/dom/RenderedDocumentMarker.h
@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include "DocumentMarker.h"
 #include <wtf/Vector.h>
 
 namespace WebCore {
diff --git a/Source/WebCore/rendering/RenderText.cpp b/Source/WebCore/rendering/RenderText.cpp
index a873e8e..3981693 100644
--- a/Source/WebCore/rendering/RenderText.cpp
+++ b/Source/WebCore/rendering/RenderText.cpp
@@ -29,7 +29,6 @@
 #include "BreakLines.h"
 #include "BreakingContext.h"
 #include "CharacterProperties.h"
-#include "DocumentMarker.h"
 #include "DocumentMarkerController.h"
 #include "EllipsisBox.h"
 #include "FloatQuad.h"
diff --git a/Source/WebCore/testing/Internals.cpp b/Source/WebCore/testing/Internals.cpp
index b9c0584..08a25b5 100644
--- a/Source/WebCore/testing/Internals.cpp
+++ b/Source/WebCore/testing/Internals.cpp
@@ -53,7 +53,6 @@
 #include "DisplayList.h"
 #include "Document.h"
 #include "DocumentLoader.h"
-#include "DocumentMarker.h"
 #include "DocumentMarkerController.h"
 #include "Editor.h"
 #include "Element.h"