diff --git a/common/cros_healthd.cc b/common/cros_healthd.cc
index 3a67364..3b7c594 100644
--- a/common/cros_healthd.cc
+++ b/common/cros_healthd.cc
@@ -343,6 +343,11 @@
         case chromeos::cros_healthd::mojom::BusInfo::Tag::kThunderboltBusInfo: {
           break;
         }
+        case chromeos::cros_healthd::mojom::BusInfo::Tag::kUnmappedField: {
+          LOG(ERROR) << "Get unmapped Mojo fields by retrieving bus info from "
+                        "cros_healthd";
+          break;
+        }
       }
     }
   }