diff --git a/cups-dnssd-deviceid.patch b/cups-dnssd-deviceid.patch
new file mode 100644
index 0000000..abb8366
--- /dev/null
+++ b/cups-dnssd-deviceid.patch
@@ -0,0 +1,38 @@
+diff -up cups-1.4.3/backend/dnssd.c.dnssd-deviceid.patch cups-1.4.3/backend/dnssd.c
+--- cups-1.4.3/backend/dnssd.c.dnssd-deviceid.patch	2010-04-16 19:36:12.226148774 +0100
++++ cups-1.4.3/backend/dnssd.c	2010-04-16 19:39:53.314148240 +0100
+@@ -1192,15 +1192,22 @@ find_device (cups_array_t *devices,
+       if (device->device_id)
+         free(device->device_id);
+ 
++      if (device_id[0])
++      {
++	  /* Mark this as the real device ID. */
++	  ptr = device_id + strlen(device_id);
++	  snprintf(ptr, sizeof(device_id) - (ptr - device_id), "FZY:0;");
++      }
++
+       if (!device_id[0] && strcmp(model, "Unknown"))
+       {
+         if (make_and_model[0])
+-	  snprintf(device_id, sizeof(device_id), "MFG:%s;MDL:%s;",
++	  snprintf(device_id, sizeof(device_id), "MFG:%s;MDL:%s;FZY:1;",
+ 	           make_and_model, model);
+         else if (!strncasecmp(model, "designjet ", 10))
+-	  snprintf(device_id, sizeof(device_id), "MFG:HP;MDL:%s", model + 10);
++	  snprintf(device_id, sizeof(device_id), "MFG:HP;MDL:%s;FZY:1;", model + 10);
+         else if (!strncasecmp(model, "stylus ", 7))
+-	  snprintf(device_id, sizeof(device_id), "MFG:EPSON;MDL:%s", model + 7);
++	  snprintf(device_id, sizeof(device_id), "MFG:EPSON;MDL:%s;FZY:1;", model + 7);
+         else if ((ptr = strchr(model, ' ')) != NULL)
+ 	{
+ 	 /*
+@@ -1210,7 +1217,7 @@ find_device (cups_array_t *devices,
+           memcpy(make_and_model, model, ptr - model);
+ 	  make_and_model[ptr - model] = '\0';
+ 
+-	  snprintf(device_id, sizeof(device_id), "MFG:%s;MDL:%s",
++	  snprintf(device_id, sizeof(device_id), "MFG:%s;MDL:%s;FZY:1;",
+ 		   make_and_model, ptr + 1);
+         }
+       }
diff --git a/cups.spec b/cups.spec
index 5577d0a..a3fe098 100644
--- a/cups.spec
+++ b/cups.spec
@@ -8,7 +8,7 @@
 Summary: Common Unix Printing System
 Name: cups
 Version: 1.4.3
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: GPLv2
 Group: System Environment/Daemons
 Source: http://ftp.easysw.com/pub/cups/%{version}/cups-%{version}-source.tar.bz2
@@ -65,6 +65,7 @@ Patch31: cups-str3505.patch
 Patch32: cups-str3541.patch
 Patch33: cups-snmp-quirks.patch
 Patch34: cups-hp-deviceid-oid.patch
+Patch35: cups-dnssd-deviceid.patch
 
 Patch100: cups-lspp.patch
 
@@ -268,6 +269,8 @@ module.
 %patch33 -p1 -b .snmp-quirks
 # Add an SNMP query for HP's device ID OID (STR #3552).
 %patch34 -p1 -b .hp-deviceid-oid
+# Mark DNS-SD Device IDs that have been guessed at with "FZY:1;".
+%patch35 -p1 -b .dnssd-deviceid
 
 %if %lspp
 # LSPP support.
@@ -568,6 +571,9 @@ rm -rf $RPM_BUILD_ROOT
 %{php_extdir}/phpcups.so
 
 %changelog
+* Fri Apr 16 2010 Tim Waugh <twaugh@redhat.com> 1:1.4.3-6
+- Mark DNS-SD Device IDs that have been guessed at with "FZY:1;".
+
 * Fri Apr 16 2010 Jiri Popelka <jpopelka@redhat.com> 1:1.4.3-5
 - Fixed str3541.patch