diff --git a/testhash.cxx b/testhash.cxx
index 68d6bbf5aed172c3a973576c38716fca21c0d23f..6665150325c21f0a926dfef475caada7aac46182 100644
--- a/testhash.cxx
+++ b/testhash.cxx
@@ -21,6 +21,7 @@
 #if 0
 # include "hash_map.hxx.in"
 # include "hash_set.hxx.in"
+# include "hashtable.hxx.in"
 # include "kwsys_ios_iostream.h.in"
 #endif