diff --git a/simgear/sound/xmlsound.cxx b/simgear/sound/xmlsound.cxx
index be5a8213..74ef4713 100644
--- a/simgear/sound/xmlsound.cxx
+++ b/simgear/sound/xmlsound.cxx
@@ -21,6 +21,10 @@
 //
 // $Id$
 
+#ifdef HAVE_CONFIG_H
+#  include <simgear_config.h>
+#endif
+
 #include <simgear/compiler.h>
 
 #include <string.h>