diff --git a/include/ntfs-3g/security.h b/include/ntfs-3g/security.h
index f6a8dace..8612dc27 100644
--- a/include/ntfs-3g/security.h
+++ b/include/ntfs-3g/security.h
@@ -183,6 +183,7 @@ struct POSIX_SECURITY {
 	int defcnt;
 	int firstdef;
 	u16 tagsset;
+	s32 alignment[0];
 	struct POSIX_ACL acl;
 } ;
         
diff --git a/libntfs-3g/compress.c b/libntfs-3g/compress.c
index fbd30ba9..e2575341 100644
--- a/libntfs-3g/compress.c
+++ b/libntfs-3g/compress.c
@@ -62,6 +62,10 @@
 #include "logging.h"
 #include "misc.h"
 
+#undef le16_to_cpup 
+/* the standard le16_to_cpup() crashes for unaligned data on some processors */ 
+#define le16_to_cpup(p) (*(u8*)(p) + (((u8*)(p))[1] << 8))
+
 /**
  * enum ntfs_compression_constants - constants used in the compression code
  */
diff --git a/libntfs-3g/object_id.c b/libntfs-3g/object_id.c
index 555dd137..8799ddba 100644
--- a/libntfs-3g/object_id.c
+++ b/libntfs-3g/object_id.c
@@ -107,7 +107,11 @@
  */
 
 typedef struct {
-	GUID object_id;
+	union {
+		/* alignment may be needed to evaluate collations */
+		u32 alignment;
+		GUID guid;
+	} object_id;
 } OBJECT_ID_INDEX_KEY;
 
 typedef struct {