diff --git a/simgear/scene/sky/sky.cxx b/simgear/scene/sky/sky.cxx
index ba3311f7..01f5a256 100644
--- a/simgear/scene/sky/sky.cxx
+++ b/simgear/scene/sky/sky.cxx
@@ -31,7 +31,7 @@
 
 #include <simgear/math/sg_random.h>
 #include <simgear/scene/util/RenderConstants.hxx>
-#include <sg_inlines.h>
+#include <simgear/sg_inlines.h>
 
 #include <osg/StateSet>
 #include <osg/Depth>