diff --git a/transporthandler.cpp b/transporthandler.cpp
index a3b3c35..7b88909 100644
--- a/transporthandler.cpp
+++ b/transporthandler.cpp
@@ -1436,12 +1436,15 @@
                 }
                 case IPSrc::Unspecified:
                 case IPSrc::Static:
-                case IPSrc::BIOS:
-                case IPSrc::BMC:
                 {
                     channelCall<setDHCPProperty>(channel, false);
                     return responseSuccess();
                 }
+                case IPSrc::BIOS:
+                case IPSrc::BMC:
+                {
+                    return responseInvalidFieldRequest();
+                }
             }
             return response(ccParamNotSupported);
         }