diff --git a/plugins/fastdwarf.cpp b/plugins/fastdwarf.cpp
index 09d831e26..feddb5546 100644
--- a/plugins/fastdwarf.cpp
+++ b/plugins/fastdwarf.cpp
@@ -179,6 +179,7 @@ DFhackCExport command_result plugin_onupdate ( color_ostream &out )
                 case unit_action_type::Block:
                 case unit_action_type::HoldItem:
                 case unit_action_type::ReleaseItem:
+                default:
                     break;
                 }
             }