diff --git a/version3/test2.cpp b/version3/test2.cpp
index e68395f..49bb3b1 100644
--- a/version3/test2.cpp
+++ b/version3/test2.cpp
@@ -1,3 +1,4 @@
+#define EXTRA_ASSERTS 1
 #include <green_crdt/v3/text_document.hpp>
 
 #include <numeric>