diff --git a/backuptar/tar.go b/backuptar/tar.go
index 53da908f..d6566dbf 100644
--- a/backuptar/tar.go
+++ b/backuptar/tar.go
@@ -303,7 +303,7 @@ func FileInfoFromHeader(hdr *tar.Header) (name string, size int64, fileInfo *win
 		if err != nil {
 			return "", 0, nil, err
 		}
-		fileInfo.FileAttributes = uintptr(attr)
+		fileInfo.FileAttributes = uint32(attr)
 	} else {
 		if hdr.Typeflag == tar.TypeDir {
 			fileInfo.FileAttributes |= syscall.FILE_ATTRIBUTE_DIRECTORY
diff --git a/fileinfo.go b/fileinfo.go
index b1d60abb..ada2fbab 100644
--- a/fileinfo.go
+++ b/fileinfo.go
@@ -20,7 +20,8 @@ const (
 // FileBasicInfo contains file access time and file attributes information.
 type FileBasicInfo struct {
 	CreationTime, LastAccessTime, LastWriteTime, ChangeTime syscall.Filetime
-	FileAttributes                                          uintptr // includes padding
+	FileAttributes                                          uint32
+	pad                                                     uint32 // padding
 }
 
 // GetFileBasicInfo retrieves times and attributes for a file.