diff --git a/libs/binder/RpcState.cpp b/libs/binder/RpcState.cpp
index 5c1b230..bac2808 100644
--- a/libs/binder/RpcState.cpp
+++ b/libs/binder/RpcState.cpp
@@ -63,6 +63,7 @@
         case RpcSession::FileDescriptorTransportMode::TRUSTY:
             return true;
     }
+    LOG_ALWAYS_FATAL("Invalid FileDescriptorTransportMode: %d", static_cast<int>(mode));
 }
 
 RpcState::RpcState() {}