diff --git a/src/system_wrappers/source/data_log_dummy.cc b/src/system_wrappers/source/data_log_dummy.cc
index 3cd177a33b..bedc82a59c 100644
--- a/src/system_wrappers/source/data_log_dummy.cc
+++ b/src/system_wrappers/source/data_log_dummy.cc
@@ -10,6 +10,8 @@
 
 #include "data_log.h"
 
+#include <string>
+
 namespace webrtc {
 
 int DataLog::CreateLog() {
@@ -19,6 +21,10 @@ int DataLog::CreateLog() {
 void DataLog::ReturnLog() {
 }
 
+std::string DataLog::Combine(const std::string& table_name, int table_id) {
+  return std::string();
+}
+
 int DataLog::AddTable(const std::string& /*table_name*/) {
   return 0;
 }