diff --git a/src/LinearMath/btScalar.h b/src/LinearMath/btScalar.h
index 8b3a7457d..8d1f8ab9e 100644
--- a/src/LinearMath/btScalar.h
+++ b/src/LinearMath/btScalar.h
@@ -17,6 +17,12 @@ subject to the following restrictions:
 #ifndef SIMD___SCALAR_H
 #define SIMD___SCALAR_H
 
+#ifdef BT_MANAGED_CODE
+//Aligned data types not supported in managed code
+#pragma unmanaged
+#endif
+
+
 #include <math.h>
 #include <stdlib.h>//size_t for MSVC 6.0
 #include <cstdlib>
@@ -42,7 +48,6 @@ inline int	btGetVersion()
 
 			#define SIMD_FORCE_INLINE inline
 			#define ATTRIBUTE_ALIGNED16(a) a
-			#define ATTRIBUTE_ALIGNED64(a) a
 			#define ATTRIBUTE_ALIGNED128(a) a
 		#else
 			//#define BT_HAS_ALIGNED_ALLOCATOR
@@ -53,7 +58,6 @@ inline int	btGetVersion()
 
 			#define SIMD_FORCE_INLINE __forceinline
 			#define ATTRIBUTE_ALIGNED16(a) __declspec(align(16)) a
-			#define ATTRIBUTE_ALIGNED64(a) __declspec(align(64)) a
 			#define ATTRIBUTE_ALIGNED128(a) __declspec (align(128)) a
 		#ifdef _XBOX
 			#define BT_USE_VMX128
@@ -89,7 +93,6 @@ inline int	btGetVersion()
 #if defined	(__CELLOS_LV2__)
 		#define SIMD_FORCE_INLINE inline
 		#define ATTRIBUTE_ALIGNED16(a) a __attribute__ ((aligned (16)))
-		#define ATTRIBUTE_ALIGNED64(a) a __attribute__ ((aligned (64)))
 		#define ATTRIBUTE_ALIGNED128(a) a __attribute__ ((aligned (128)))
 		#ifndef assert
 		#include <assert.h>
@@ -111,7 +114,6 @@ inline int	btGetVersion()
 
 		#define SIMD_FORCE_INLINE __inline
 		#define ATTRIBUTE_ALIGNED16(a) a __attribute__ ((aligned (16)))
-		#define ATTRIBUTE_ALIGNED64(a) a __attribute__ ((aligned (64)))
 		#define ATTRIBUTE_ALIGNED128(a) a __attribute__ ((aligned (128)))
 		#ifndef assert
 		#include <assert.h>
@@ -139,7 +141,6 @@ inline int	btGetVersion()
 	#define SIMD_FORCE_INLINE inline
 ///@todo: check out alignment methods for other platforms/compilers
 	#define ATTRIBUTE_ALIGNED16(a) a __attribute__ ((aligned (16)))
-	#define ATTRIBUTE_ALIGNED64(a) a __attribute__ ((aligned (64)))
 	#define ATTRIBUTE_ALIGNED128(a) a __attribute__ ((aligned (128)))
 	#ifndef assert
 	#include <assert.h>
@@ -161,10 +162,8 @@ inline int	btGetVersion()
 		#define SIMD_FORCE_INLINE inline
 		///@todo: check out alignment methods for other platforms/compilers
 		///#define ATTRIBUTE_ALIGNED16(a) a __attribute__ ((aligned (16)))
-		///#define ATTRIBUTE_ALIGNED64(a) a __attribute__ ((aligned (64)))
 		///#define ATTRIBUTE_ALIGNED128(a) a __attribute__ ((aligned (128)))
 		#define ATTRIBUTE_ALIGNED16(a) a
-		#define ATTRIBUTE_ALIGNED64(a) a
 		#define ATTRIBUTE_ALIGNED128(a) a
 		#ifndef assert
 		#include <assert.h>