diff --git a/src/ATC/trafficcontrol.cxx b/src/ATC/trafficcontrol.cxx
index 71df2da23..621687687 100644
--- a/src/ATC/trafficcontrol.cxx
+++ b/src/ATC/trafficcontrol.cxx
@@ -34,7 +34,7 @@
 #include <simgear/scene/material/EffectGeode.hxx>
 #include <simgear/scene/material/matlib.hxx>
 #include <simgear/scene/material/mat.hxx>
-#include <simgear/scene/util/OSGMath.hxx>
+#include <simgear/scene/util/OsgMath.hxx>
 #include <Scenery/scenery.hxx>
 
 #include "trafficcontrol.hxx"
diff --git a/src/Airports/groundnetwork.cxx b/src/Airports/groundnetwork.cxx
index dbbcaf95c..c20cf2bea 100644
--- a/src/Airports/groundnetwork.cxx
+++ b/src/Airports/groundnetwork.cxx
@@ -38,7 +38,7 @@
 #include <simgear/scene/material/EffectGeode.hxx>
 #include <simgear/scene/material/matlib.hxx>
 #include <simgear/scene/material/mat.hxx>
-#include <simgear/scene/util/OSGMath.hxx>
+#include <simgear/scene/util/OsgMath.hxx>
 
 #include <Airports/simple.hxx>
 #include <Airports/dynamics.hxx>
diff --git a/src/FDM/groundcache.cxx b/src/FDM/groundcache.cxx
index d947941cc..21d2816d6 100644
--- a/src/FDM/groundcache.cxx
+++ b/src/FDM/groundcache.cxx
@@ -43,7 +43,7 @@
 #include <simgear/math/SGMisc.hxx>
 #include <simgear/scene/util/SGNodeMasks.hxx>
 #include <simgear/scene/util/SGSceneUserData.hxx>
-#include <simgear/scene/util/OSGMath.hxx>
+#include <simgear/scene/util/OsgMath.hxx>
 
 #include <simgear/scene/bvh/BVHNode.hxx>
 #include <simgear/scene/bvh/BVHGroup.hxx>
diff --git a/src/Scenery/scenery.cxx b/src/Scenery/scenery.cxx
index fcb4d312e..ba67e1f8f 100644
--- a/src/Scenery/scenery.cxx
+++ b/src/Scenery/scenery.cxx
@@ -40,7 +40,7 @@
 #include <simgear/scene/tgdb/userdata.hxx>
 #include <simgear/scene/material/matlib.hxx>
 #include <simgear/scene/util/SGNodeMasks.hxx>
-#include <simgear/scene/util/OSGMath.hxx>
+#include <simgear/scene/util/OsgMath.hxx>
 #include <simgear/scene/util/SGSceneUserData.hxx>
 #include <simgear/scene/model/CheckSceneryVisitor.hxx>
 #include <simgear/scene/bvh/BVHNode.hxx>