diff --git a/src/processor/tokenize.cc b/src/processor/tokenize.cc
index a46c9644c..47fc3fec0 100644
--- a/src/processor/tokenize.cc
+++ b/src/processor/tokenize.cc
@@ -32,6 +32,7 @@
 
 #include <string.h>
 
+#include <algorithm>
 #include <string>
 #include <vector>