diff --git a/src/config_passthrough.cpp b/src/config_passthrough.cpp
index 277ccfcb..b89ca2f2 100644
--- a/src/config_passthrough.cpp
+++ b/src/config_passthrough.cpp
@@ -24,7 +24,7 @@ template<>
 std::string
 Passthrough::to_string() const
 {
-  BE_Passthrough x = 0;
+  BE_Passthrough x = BE_Passthrough::_from_intergral(0);
 
   return x._to_string();