diff --git a/simgear/io/lowlevel.cxx b/simgear/io/lowlevel.cxx
index 0015bff3..f8c72342 100644
--- a/simgear/io/lowlevel.cxx
+++ b/simgear/io/lowlevel.cxx
@@ -23,6 +23,8 @@
 // $Id$
 
 
+#include <string.h>		// for memcpy()
+
 #include "lowlevel.hxx"