diff --git a/s3fs/s3fs.cpp b/s3fs/s3fs.cpp
index fa73c8b..70cfe2e 100644
--- a/s3fs/s3fs.cpp
+++ b/s3fs/s3fs.cpp
@@ -42,6 +42,7 @@
 #include <stack>
 #include <string>
 #include <vector>
+#include <algorithm>
 
 using namespace std;