diff --git a/src/AIModel/AITanker.cxx b/src/AIModel/AITanker.cxx
index 6582e00e1..5d5d72a5b 100644
--- a/src/AIModel/AITanker.cxx
+++ b/src/AIModel/AITanker.cxx
@@ -19,6 +19,9 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
 
 #include "AITanker.hxx"