diff --git a/simgear/scene/model/placementtrans.cxx b/simgear/scene/model/placementtrans.cxx
index 34a7f215..960b37cc 100644
--- a/simgear/scene/model/placementtrans.cxx
+++ b/simgear/scene/model/placementtrans.cxx
@@ -19,6 +19,9 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 //
 
+#ifdef HAVE_CONFIG_H
+#  include <simgear_config.h>
+#endif
 
 #ifndef __cplusplus
 # error This library requires C++
diff --git a/simgear/scene/sky/stars.cxx b/simgear/scene/sky/stars.cxx
index 59717505..22cf539a 100644
--- a/simgear/scene/sky/stars.cxx
+++ b/simgear/scene/sky/stars.cxx
@@ -23,6 +23,9 @@
 //
 // $Id$
 
+#ifdef HAVE_CONFIG_H
+#  include <simgear_config.h>
+#endif
 
 #include <simgear/compiler.h>
 #include <simgear/constants.h>