diff --git a/indra/test/chained_callback.h b/indra/test/chained_callback.h
index 41a7f7c9fa53d920b30af598d8be1ce4fb8b2afa..05929e33ad2d36281e13a4eccff84c0065e6b0f7 100644
--- a/indra/test/chained_callback.h
+++ b/indra/test/chained_callback.h
@@ -12,6 +12,8 @@
 #if ! defined(LL_CHAINED_CALLBACK_H)
 #define LL_CHAINED_CALLBACK_H
 
+#include "lltut.h"
+
 /**
  * Derive your TUT callback from chained_callback instead of tut::callback to
  * ensure that multiple such callbacks can coexist in a given test executable.