diff --git a/plugins/devel/CMakeLists.txt b/plugins/devel/CMakeLists.txt
index c121d977f..210669a75 100644
--- a/plugins/devel/CMakeLists.txt
+++ b/plugins/devel/CMakeLists.txt
@@ -26,4 +26,4 @@ if(UNIX)
     dfhack_plugin(ref-index ref-index.cpp)
 endif()
 
-# add_subdirectory(check-structures-sanity)
+add_subdirectory(check-structures-sanity)