diff --git a/lib/diameter.py b/lib/diameter.py
index caa9d0b..00fb694 100755
--- a/lib/diameter.py
+++ b/lib/diameter.py
@@ -1264,7 +1264,7 @@ def Answer_257(self, packet_vars, avps):
         avp += self.generate_avp(266, 40, "00000000")                                               #Vendor-Id
         avp += self.generate_avp(269, "00", self.ProductName)                                       #Product-Name
 
-        avp += self.generate_avp(267, 40, "000027d9")                                               #Firmware-Revision
+        avp += self.generate_avp(267, "00", "000027d9")                                               #Firmware-Revision
         avp += self.generate_avp(265, 40, format(int(10415),"x").zfill(8))                               #Supported-Vendor-ID (3GPP)
         avp += self.generate_avp(260, 40, "000001024000000c" + format(int(16777251),"x").zfill(8) +  "0000010a4000000c000028af")      #Vendor-Specific-Application-ID (S6a)
         avp += self.generate_avp(265, 40, format(int(10415),"x").zfill(8))                               #Supported-Vendor-ID (3GPP)