diff --git a/code/c++/search_ranges2.cc b/code/c++/search_ranges2.cc
index ffd3660..868bf67 100644
--- a/code/c++/search_ranges2.cc
+++ b/code/c++/search_ranges2.cc
@@ -47,7 +47,8 @@ search(const string & dbpath, const string & querystring,
         PopulationRangeProcessor(Xapian::valueno slot, int low_, int high_)
 	    : Xapian::NumberRangeProcessor(slot), low(low_), high(high_) { }
 	
-	Xapian::Query operator()(const string& begin, const string& end) {
+	Xapian::Query operator()(const string& begin,
+                                 const string& end) override {
 	    if (!check_range_end(begin))
 		 return Xapian::Query(Xapian::Query::OP_INVALID);
 	    if (!check_range_end(end))
diff --git a/code/c++/search_sorting3.cc b/code/c++/search_sorting3.cc
index 5c2b89c..6f67447 100644
--- a/code/c++/search_sorting3.cc
+++ b/code/c++/search_sorting3.cc
@@ -34,7 +34,7 @@ search(const string & dbpath, const string & querystring,
     enquire.set_query(query);
     // Start of example code.
     class DistanceKeyMaker : public Xapian::KeyMaker {
-	string operator()(const Xapian::Document& doc) const {
+	string operator()(const Xapian::Document& doc) const override {
             // we want to return a sortable string which represents
             // the distance from Washington, DC to the middle of this
             // state.