diff --git a/patch/patch.cfg b/patch/patch.cfg
index ae6fde745..93ff8d5fe 100644
--- a/patch/patch.cfg
+++ b/patch/patch.cfg
@@ -41,6 +41,12 @@ patches = [
     'name': 'webkit_popups',
     'path': '../third_party/WebKit/',
   },
+  {
+    # Fix export of UnderlayOpenGLHostingWindow for 64-bit OS X builds.
+    # http://code.google.com/p/chromiumembedded/issues/detail?id=1051
+    'name': 'underlay_1051',
+    'path': '../ui/base/cocoa/',
+  },
   {
     # http://code.google.com/p/chromiumembedded/issues/detail?id=364
     'name': 'spi_webcore_364',
diff --git a/patch/patches/underlay_1051.patch b/patch/patches/underlay_1051.patch
new file mode 100644
index 000000000..1c837493f
--- /dev/null
+++ b/patch/patches/underlay_1051.patch
@@ -0,0 +1,13 @@
+Index: underlay_opengl_hosting_window.h
+===================================================================
+--- underlay_opengl_hosting_window.h	(revision 214871)
++++ underlay_opengl_hosting_window.h	(working copy)
+@@ -12,7 +12,7 @@
+ // Common base class for windows that host a OpenGL surface that renders under
+ // the window. Contains methods relating to hole punching so that the OpenGL
+ // surface is visible through the window.
+-UI_EXPORT
++__attribute__((visibility("default")))
+ @interface UnderlayOpenGLHostingWindow : NSWindow
+ @end
+