diff --git a/src/mongo/db/fts/fts_spec.cpp b/src/mongo/db/fts/fts_spec.cpp
index f825cce4ce798..450f49f9a6244 100644
--- a/src/mongo/db/fts/fts_spec.cpp
+++ b/src/mongo/db/fts/fts_spec.cpp
@@ -193,7 +193,7 @@ void FTSSpec::_scoreStringV2(FTSTokenizer* tokenizer,
     tokenizer->reset(raw.rawData(), FTSTokenizer::kFilterStopWords);
 
     while (tokenizer->moveNext()) {
-        string term = tokenizer->get().toString();
+        StringData term = tokenizer->get();
 
         ScoreHelperStruct& data = terms[term];
 
diff --git a/src/mongo/db/fts/fts_spec.h b/src/mongo/db/fts/fts_spec.h
index d5cc0b46472dd..6356f3a58a8b8 100644
--- a/src/mongo/db/fts/fts_spec.h
+++ b/src/mongo/db/fts/fts_spec.h
@@ -40,6 +40,7 @@
 #include "mongo/db/fts/stop_words.h"
 #include "mongo/db/fts/tokenizer.h"
 #include "mongo/platform/unordered_map.h"
+#include "mongo/util/string_map.h"
 
 namespace mongo {
 
@@ -58,7 +59,7 @@ struct ScoreHelperStruct {
     double count;
     double exp;
 };
-typedef unordered_map<std::string, ScoreHelperStruct> ScoreHelperMap;
+typedef StringMap<ScoreHelperStruct> ScoreHelperMap;
 
 class FTSSpec {
     struct Tools {