diff --git a/uboone_bdt_app/apps/bdt_convert.cxx b/uboone_bdt_app/apps/bdt_convert.cxx
index 908f044..dc090d3 100644
--- a/uboone_bdt_app/apps/bdt_convert.cxx
+++ b/uboone_bdt_app/apps/bdt_convert.cxx
@@ -2,6 +2,7 @@
 
 #include <cstdlib>
 #include <iostream>
+#include <fstream>
 #include <set>
 #include <map>
 #include <string>