diff --git a/web/service/inbound.go b/web/service/inbound.go
index 04dd2851..798f12ea 100644
--- a/web/service/inbound.go
+++ b/web/service/inbound.go
@@ -2446,7 +2446,7 @@ func (s *InboundService) syncWithSlaves(method string, path string, contentType
 						form.Set(key, fmt.Sprintf("%v", value))
 					}
 				default:
-					logger.Warningf("Unsupported body type for form encoding on server %s", server.Name)
+					logger.Warningf("Unsupported body type: %T for form encoding on server %s", v, server.Name)
 					continue
 				}
 				bodyReader = strings.NewReader(form.Encode())