diff --git a/internal/cld2_do_score.cc b/internal/cld2_do_score.cc
index 4099907..440cf99 100644
--- a/internal/cld2_do_score.cc
+++ b/internal/cld2_do_score.cc
@@ -23,6 +23,7 @@
 #include "compact_lang_det_impl.h"
 #include "lang_script.h"
 
+using namespace std;
 using namespace CLD2;
 
 double bytes[NUM_LANGUAGES][4];