diff --git a/src/xrPhysics/ExtendedGeom.cpp b/src/xrPhysics/ExtendedGeom.cpp
index e6e48799f3f..3a2480fe92d 100644
--- a/src/xrPhysics/ExtendedGeom.cpp
+++ b/src/xrPhysics/ExtendedGeom.cpp
@@ -1,6 +1,6 @@
 #include "stdafx.h"
 #include "ExtendedGeom.h"
-#include "dCylinder/dCylinder.h"
+#include "dcylinder/dCylinder.h"
 bool IsCyliderContact(const dContact& c)
 {
     int geomClass = -1;
diff --git a/src/xrPhysics/Geometry.cpp b/src/xrPhysics/Geometry.cpp
index fdf8f63b096..4ef0596a100 100644
--- a/src/xrPhysics/Geometry.cpp
+++ b/src/xrPhysics/Geometry.cpp
@@ -2,7 +2,7 @@
 #include "Geometry.h"
 #include "PHDynamicData.h"
 #include "ExtendedGeom.h"
-#include "dCylinder/dCylinder.h"
+#include "dcylinder/dCylinder.h"
 
 #include "xrCore/Animation/Bone.hpp"
 
diff --git a/src/xrPhysics/Physics.h b/src/xrPhysics/Physics.h
index e83d8078a88..9db941ca236 100644
--- a/src/xrPhysics/Physics.h
+++ b/src/xrPhysics/Physics.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "dCylinder/dCylinder.h"
+#include "dcylinder/dCylinder.h"
 #include "PhysicsShell.h"
 #include "PHObject.h"
 #include "PHInterpolation.h"
diff --git a/src/xrPhysics/dRayMotions.cpp b/src/xrPhysics/dRayMotions.cpp
index 1f2fc483a7b..04a7ec3cab8 100644
--- a/src/xrPhysics/dRayMotions.cpp
+++ b/src/xrPhysics/dRayMotions.cpp
@@ -1,5 +1,5 @@
 #include "stdafx.h"
-#include "dCylinder/dCylinder.h"
+#include "dcylinder/dCylinder.h"
 struct dContactGeom;
 int dCollideCylRay(dxGeom* o1, dxGeom* o2, int flags, dContactGeom* contact, int skip);
 
diff --git a/src/xrPhysics/dCylinder/dCylinder.cpp b/src/xrPhysics/dcylinder/dCylinder.cpp
similarity index 100%
rename from src/xrPhysics/dCylinder/dCylinder.cpp
rename to src/xrPhysics/dcylinder/dCylinder.cpp
diff --git a/src/xrPhysics/dCylinder/dCylinder.h b/src/xrPhysics/dcylinder/dCylinder.h
similarity index 100%
rename from src/xrPhysics/dCylinder/dCylinder.h
rename to src/xrPhysics/dcylinder/dCylinder.h
diff --git a/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.cpp b/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.cpp
index 19a3ba2635c..92aad211498 100644
--- a/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.cpp
+++ b/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.cpp
@@ -1,6 +1,6 @@
 #include "stdafx.h"
 #include "dTriColliderCommon.h"
-#include "xrPhysics/dCylinder/dCylinder.h"
+#include "xrPhysics/dcylinder/dCylinder.h"
 #include "dTriCylinder.h"
 #include "xrPhysics/MathUtils.h"
 #include "dcTriListCollider.h"
diff --git a/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.h b/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.h
index c62cc4740c0..0b7a05c5284 100644
--- a/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.h
+++ b/src/xrPhysics/tri-colliderKNoOPC/dTriCylinder.h
@@ -1,6 +1,6 @@
 #ifndef D_TRI_CYLINDER_H
 #define D_TRI_CYLINDER_H
-#include "xrPhysics/dCylinder/dCylinder.h"
+#include "xrPhysics/dcylinder/dCylinder.h"
 #include "TriPrimitiveCollideClassDef.h"
 #include "dcTriListCollider.h"
 
diff --git a/src/xrPhysics/tri-colliderKNoOPC/dcTriListCollider.cpp b/src/xrPhysics/tri-colliderKNoOPC/dcTriListCollider.cpp
index 9a95fdf5a45..cf658e14d5f 100644
--- a/src/xrPhysics/tri-colliderKNoOPC/dcTriListCollider.cpp
+++ b/src/xrPhysics/tri-colliderKNoOPC/dcTriListCollider.cpp
@@ -2,7 +2,7 @@
 #include "xrCDB/Intersect.hpp"
 #include "dTriCollideK.h"
 #include "dSortTriPrimitive.h"
-#include "xrPhysics/dCylinder/dCylinder.h"
+#include "xrPhysics/dcylinder/dCylinder.h"
 #include "xrPhysics/MathUtils.h"
 #ifdef DEBUG
 #include "xrPhysics/debug_output.h"