diff --git base/strings/string_piece.h base/strings/string_piece.h
index 5ceb3a40eb01b..89476bfa41e9b 100644
--- base/strings/string_piece.h
+++ base/strings/string_piece.h
@@ -23,6 +23,7 @@
 
 #include <stddef.h>
 
+#include <algorithm>
 #include <iosfwd>
 #include <limits>
 #include <string>