diff --git a/ripemd.cc b/ripemd.cc
index 14dd491..044535f 100644
--- a/ripemd.cc
+++ b/ripemd.cc
@@ -18,6 +18,7 @@
 
 #include "ripemd.hh"
 
+#include <limits>
 #include <string.h>
 #include <QtEndian>