diff --git a/simgear/misc/sg_dir.cxx b/simgear/misc/sg_dir.cxx
index e8775093..74b493ed 100644
--- a/simgear/misc/sg_dir.cxx
+++ b/simgear/misc/sg_dir.cxx
@@ -31,6 +31,7 @@
 
 #include <simgear/debug/logstream.hxx>
 
+#include <cstring>
 #include <iostream>
 
 namespace simgear