diff --git a/src/ATC/ATC.cxx b/src/ATC/ATC.cxx
index 38af59ef5..2a51b89a5 100644
--- a/src/ATC/ATC.cxx
+++ b/src/ATC/ATC.cxx
@@ -18,6 +18,10 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <simgear/sound/soundmgr.hxx>
 
 #include <Main/fgfs.hxx>