diff --git a/Build.sh b/Build.sh
index 2d5b181..7bf0043 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-# $MirOS: src/bin/mksh/Build.sh,v 1.237 2007/07/04 14:53:19 tg Exp $
+# $MirOS: src/bin/mksh/Build.sh,v 1.238 2007/07/09 11:19:55 tg Exp $
 #-
 # Environment used: CC CFLAGS CPPFLAGS LDFLAGS LIBS NOWARN NROFF TARGET_OS
 # CPPFLAGS recognised:	MKSH_SMALL MKSH_ASSUME_UTF8 MKSH_NEED_MKNOD MKSH_NOPWNAM
@@ -599,11 +599,11 @@ ac_testn can_lfs '' "if we support large files" <lft.c
 save_CPPFLAGS=$CPPFLAGS
 CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=64"
 ac_testn can_lfs_sus '!' can_lfs 0 "... with -D_FILE_OFFSET_BITS=64" <lft.c
-test 1 = $HAVE_CAN_LFS_SUS || CPPFLAGS=$save_CPPFLAGS
-save_CPPFLAGS=$CPPFLAGS
-CPPFLAGS="$CPPFLAGS -D_LARGE_FILES=1"
-ac_testn can_lfs_aix '!' can_lfs 0 "... with -D_LARGE_FILES=1" <lft.c
-test 1 = $HAVE_CAN_LFS_AIX || CPPFLAGS=$save_CPPFLAGS
+if test 0 = $HAVE_CAN_LFS_SUS; then
+	CPPFLAGS="$save_CPPFLAGS -D_LARGE_FILES=1"
+	ac_testn can_lfs_aix '!' can_lfs 0 "... with -D_LARGE_FILES=1" <lft.c
+	test 1 = $HAVE_CAN_LFS_AIX || CPPFLAGS=$save_CPPFLAGS
+fi
 rm -f lft.c lft.o	# end of large file support test
 
 #