1 files changed, 1 insertions, 1 deletions
diff --git a/src/RTree.h b/src/RTree.h
index 6cf0292e..bbf9a486 100644
--- a/src/RTree.h
+++ b/src/RTree.h
@@ -37,7 +37,7 @@ template<typename T> struct rtree_pool final
     void free(T* pool);
 
     union node_u {
-        union { T data; };
+        union { T data; char _empty = {}; };
         node_u* next;
     };