diff --git a/kernel/hashlib.h b/kernel/hashlib.h
index 8c977de2..c9602392 100644
--- a/kernel/hashlib.h
+++ b/kernel/hashlib.h
@@ -12,6 +12,7 @@
 #ifndef HASHLIB_H
 
 #include <stdexcept>
+#include <algorithm>
 #include <string>
 #include <vector>