diff --git a/src/meters.cc b/src/meters.cc
index ffc9af5..4f25199 100644
--- a/src/meters.cc
+++ b/src/meters.cc
@@ -970,7 +970,7 @@ void MeterCommonImplementation::addNumericFieldWithCalculator(string vname,
                   vquantity,
                   use_unit == Unit::Unknown ? defaultUnitForQuantity(vquantity) : use_unit,
                   VifScaling::Auto,
-                  NULL,
+                  FieldMatcher::build(),
                   help,
                   print_properties,
                   NULL,