diff --git a/chromeos/data_encoding_unittest.cc b/chromeos/data_encoding_unittest.cc
index 549c478..70bd748 100644
--- a/chromeos/data_encoding_unittest.cc
+++ b/chromeos/data_encoding_unittest.cc
@@ -5,6 +5,7 @@
 #include <chromeos/data_encoding.h>
 
 #include <algorithm>
+#include <numeric>
 
 #include <gtest/gtest.h>