diff --git a/simgear/debug/logstream.cxx b/simgear/debug/logstream.cxx
index f3bcc99d..4de13f0c 100644
--- a/simgear/debug/logstream.cxx
+++ b/simgear/debug/logstream.cxx
@@ -24,6 +24,7 @@
 
 #include <iostream>
 #include <fstream>
+#include <algorithm>
 
 #include <boost/foreach.hpp>