diff --git a/core/lib/GNSSEph/RationalizeRinexNav.cpp b/core/lib/GNSSEph/RationalizeRinexNav.cpp
index b0cdd4463..f9fe7f5a8 100755
--- a/core/lib/GNSSEph/RationalizeRinexNav.cpp
+++ b/core/lib/GNSSEph/RationalizeRinexNav.cpp
@@ -130,6 +130,7 @@ namespace gpstk
          }
       }
       rns->close();
+      return true;
    }
 
    //----------------------------------------------------------------