diff --git a/simgear/scene/material/EffectCullVisitor.cxx b/simgear/scene/material/EffectCullVisitor.cxx
index 9960a4d4..c44d8d69 100644
--- a/simgear/scene/material/EffectCullVisitor.cxx
+++ b/simgear/scene/material/EffectCullVisitor.cxx
@@ -27,7 +27,7 @@
 #include "Effect.hxx"
 #include "Technique.hxx"
 
-#include <scene\util\RenderConstants.hxx>
+#include <simgear/scene/util/RenderConstants.hxx>
 
 namespace simgear
 {