diff --git a/interface/wx/numformatter.h b/interface/wx/numformatter.h
index db678d08f5..c6e0eaffe2 100644
--- a/interface/wx/numformatter.h
+++ b/interface/wx/numformatter.h
@@ -70,7 +70,10 @@ public:
             Combination of values from the Style enumeration (except for
             Style_NoTrailingZeroes which can't be used with this overload).
     */
+    //@{
     static wxString ToString(long val, int flags = Style_WithThousandsSep);
+    static wxString ToString(long long val, int flags = Style_WithThousandsSep);
+    //@}
 
     /**
         Returns string representation of a floating point number.
@@ -98,6 +101,7 @@ public:
      */
     //@{
     static bool FromString(wxString s, long *val);
+    static bool FromString(wxString s, long long *val);
     static bool FromString(wxString s, double *val);
     //@}