diff --git a/modules/mol/base/src/residue_prop.hh b/modules/mol/base/src/residue_prop.hh
index d4d79fd688ed96cf6f197f13e4116270e84ff212..ff1c5c11b3ec30947954ba023c2ae71b761c82d3 100644
--- a/modules/mol/base/src/residue_prop.hh
+++ b/modules/mol/base/src/residue_prop.hh
@@ -127,7 +127,7 @@ typedef std::vector<ResNum> ResNumList;
 
 inline std::ostream& operator<<(std::ostream& os, const ResNum& n)
 {
-  return os << n.GetNum();
+  os << n.GetNum();
   if (n.GetInsCode()!='\0')
     os << n.GetInsCode();
   return os;