diff --git a/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.cpp b/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.cpp
index f19ba271..51580049 100644
--- a/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.cpp
+++ b/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.cpp
@@ -90,6 +90,8 @@ using namespace Cm;
 		return ir;
 	}*/
 
+namespace internalMBP {
+
 struct RegionHandle : public Ps::UserAllocated
 {
 	PxU16	mHandle;			// Handle from region
@@ -582,6 +584,10 @@ struct RegionData : public Ps::UserAllocated
 	#endif
 #endif
 
+}
+
+using namespace internalMBP;
+
 ///////////////////////////////////////////////////////////////////////////////
 
 MBP_PairManager::MBP_PairManager() :
diff --git a/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.h b/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.h
index cf15f6d3..90f43e47 100644
--- a/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.h
+++ b/physx/source/lowlevelaabb/src/BpBroadPhaseMBP.h
@@ -35,8 +35,10 @@
 #include "BpBroadPhaseMBPCommon.h"
 #include "BpMBPTasks.h"
 
+namespace internalMBP {
 	class MBP;
-	
+}
+
 namespace physx
 {
 namespace Bp
@@ -84,7 +86,7 @@ namespace Bp
 				MBPUpdateWorkTask			mMBPUpdateWorkTask;
 				MBPPostUpdateWorkTask		mMBPPostUpdateWorkTask;
 
-				MBP*						mMBP;		// PT: TODO: aggregate
+				internalMBP::MBP*			mMBP;		// PT: TODO: aggregate
 
 				MBP_Handle*					mMapping;
 				PxU32						mCapacity;