diff --git a/evolution-data-server-1.12.3-caldav-mime-type-parsing.patch b/evolution-data-server-1.12.3-caldav-mime-type-parsing.patch
new file mode 100644
index 0000000..a380c78
--- /dev/null
+++ b/evolution-data-server-1.12.3-caldav-mime-type-parsing.patch
@@ -0,0 +1,12 @@
+diff -up evolution-data-server-1.12.3/calendar/backends/caldav/e-cal-backend-caldav.c.caldav-mime-type-parsing evolution-data-server-1.12.3/calendar/backends/caldav/e-cal-backend-caldav.c
+--- evolution-data-server-1.12.3/calendar/backends/caldav/e-cal-backend-caldav.c.caldav-mime-type-parsing	2008-07-10 07:55:01.000000000 -0400
++++ evolution-data-server-1.12.3/calendar/backends/caldav/e-cal-backend-caldav.c	2008-07-10 07:55:34.000000000 -0400
+@@ -1208,7 +1208,7 @@ caldav_server_get_object (ECalBackendCal
+ 
+ 	hdr = soup_message_get_header (message->response_headers, "Content-Type");
+ 
+-	if (hdr == NULL || g_ascii_strcasecmp (hdr, "text/calendar")) {
++	if (hdr == NULL || g_ascii_strncasecmp (hdr, "text/calendar", 13)) {
+ 		result = GNOME_Evolution_Calendar_InvalidObject;
+ 		g_object_unref (message);
+ 		g_warning ("Object to fetch not of type text/calendar");
diff --git a/evolution-data-server.spec b/evolution-data-server.spec
index 2159b2f..09a82be 100644
--- a/evolution-data-server.spec
+++ b/evolution-data-server.spec
@@ -27,7 +27,7 @@
 
 Name: evolution-data-server
 Version: 1.12.3
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: LGPL
 Group: System Environment/Libraries
 Summary: Backend data server for Evolution
@@ -74,6 +74,9 @@ Patch22: evolution-data-server-1.12.3-efolder-leak.patch
 # RH bug #440455
 Patch23: evolution-data-server-1.12.3-large-files.patch
 
+# RH bug #451230 / GNOME #514487
+Patch24: evolution-data-server-1.12.3-caldav-mime-type-parsing.patch
+
 ### Dependencies ###
 
 Requires: GConf2
@@ -166,6 +169,7 @@ evolution-data-server.
 %patch21 -p1 -b .e2k-context-fba
 %patch22 -p1 -b .efolder-leak
 %patch23 -p1 -b .large_files
+%patch24 -p1 -b .caldav-mime-type-parsing
 
 gtkdocize
 
@@ -400,6 +404,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_libdir}/pkgconfig/libexchange-storage-%{eds_api_version}.pc
 
 %changelog
+* Thu Jul 10 2008 Matthew Barnes <mbarnes@redhat.com> - 1.12.3-6.fc8
+- Add patch for RH bug #451230 (CalDAV MIME type detection).
+
 * Fri Apr 04 2008 Milan Crha <mcrha@redhat.com> - 1.12.3-5.fc8
 - Add patch for RH bug #440455 (Large file support for local stores).