diff --git a/message_cache.cc b/message_cache.cc
index 6ca47cf..71fa402 100644
--- a/message_cache.cc
+++ b/message_cache.cc
@@ -1,6 +1,7 @@
 #include "message_cache.hh"
 #include <cassert>
 #include <cstring>
+#include <climits>
 #include <random>
 
 pEp::MessageCache pEp::message_cache;