diff --git a/testDynamicLoader.cxx b/testDynamicLoader.cxx
index 4491978468305c81da34c96624fadb6e2b119ec0..e9644591ee5a06526d2d6aad2f8d977409d46f5d 100644
--- a/testDynamicLoader.cxx
+++ b/testDynamicLoader.cxx
@@ -22,6 +22,7 @@
 #if 0
 # include "DynamicLoader.hxx.in"
 # include "kwsys_ios_iostream.h.in"
+# include "kwsys_stl_string.hxx.in"
 #endif
 
 #include "testSystemTools.h"