diff --git a/evolution-ews-3.5.90-xmlbuffer.patch b/evolution-ews-3.5.90-xmlbuffer.patch
new file mode 100644
index 0000000..e6675b2
--- /dev/null
+++ b/evolution-ews-3.5.90-xmlbuffer.patch
@@ -0,0 +1,35 @@
+diff --git a/src/server/e-ews-connection.c b/src/server/e-ews-connection.c
+index e3ec167..b239e61 100644
+--- a/src/server/e-ews-connection.c
++++ b/src/server/e-ews-connection.c
+@@ -1956,8 +1956,13 @@ static void post_restarted (SoupMessage *msg, gpointer data)
+ 
+ 	soup_message_set_request (
+ 		msg, "text/xml; charset=utf-8", SOUP_MEMORY_COPY,
+-		(gchar *) buf->buffer->content,
+-		buf->buffer->use);
++		(gchar *)
++			#ifdef LIBXML2_NEW_BUFFER
++			xmlOutputBufferGetContent (buf), xmlOutputBufferGetSize (buf)
++			#else
++			buf->buffer->content, buf->buffer->use
++			#endif
++		);
+ }
+ 
+ static SoupMessage *
+@@ -1978,7 +1983,13 @@ e_ews_get_msg_for_url (const gchar *url,
+ 	if (buf != NULL) {
+ 		soup_message_set_request (
+ 			msg, "text/xml; charset=utf-8", SOUP_MEMORY_COPY,
+-			(gchar *) buf->buffer->content, buf->buffer->use);
++			(gchar *)
++			#ifdef LIBXML2_NEW_BUFFER
++			xmlOutputBufferGetContent (buf), xmlOutputBufferGetSize (buf)
++			#else
++			buf->buffer->content, buf->buffer->use
++			#endif
++			);
+ 		g_signal_connect (
+ 			msg, "restarted",
+ 			G_CALLBACK (post_restarted), buf);
diff --git a/evolution-ews.spec b/evolution-ews.spec
index c40044b..3c6c0e1 100644
--- a/evolution-ews.spec
+++ b/evolution-ews.spec
@@ -9,6 +9,8 @@ License: LGPLv2
 URL: http://projects.gnome.org/evolution
 Source: http://download.gnome.org/sources/%{name}/3.5/%{name}-%{version}.tar.xz
 
+Patch01: evolution-ews-3.5.90-xmlbuffer.patch
+
 Requires: evolution >= %{version}
 Requires: evolution-data-server >= %{version}
 
@@ -22,6 +24,7 @@ versions 2007 and later, through its Exchange Web Services (EWS) interface.
 
 %prep
 %setup -q
+%patch01 -p1 -b .xmlbuffer
 
 %build
 %configure
@@ -67,6 +70,7 @@ rm $RPM_BUILD_ROOT%{_libdir}/pkgconfig/*.pc
 %changelog
 * Mon Aug 20 2012 Milan Crha <mcrha@redhat.com> - 3.5.90-1
 - Update to 3.5.90
+- Add patch for new xmlOutputBuffer API
 
 * Mon Aug 06 2012 Milan Crha <mcrha@redhat.com> - 3.5.5-1
 - Update to 3.5.5