diff --git a/simgear/scene/tsync/terrasync.cxx b/simgear/scene/tsync/terrasync.cxx
index b07f1819..209d0b81 100644
--- a/simgear/scene/tsync/terrasync.cxx
+++ b/simgear/scene/tsync/terrasync.cxx
@@ -46,6 +46,7 @@
 #include <fstream>
 #include <string>
 #include <map>
+#include <algorithm>
 
 #include <simgear/version.h>