diff --git a/ChangeLog b/ChangeLog
index 8bd03aca..ed33cc31 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2009-10-07  Bob Friesenhahn  <bfriesen@simple.dallas.tx.us>
+
+	* configure.ac: x86_64 should use the same fill order as i386.
+
 2009-09-24  Bob Friesenhahn  <bfriesen@simple.dallas.tx.us>
 
 	* tools/tiffcrop.c, man/tiffcrop.1: New tiffcrop from Richard
diff --git a/configure b/configure
index 64c55fe3..6e1a09fe 100755
--- a/configure
+++ b/configure
@@ -16121,7 +16121,7 @@ done
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking native cpu bit order" >&5
 $as_echo_n "checking native cpu bit order... " >&6; }
 case "$target_cpu" in
-    i*86*)
+    i*86*|x86_64*)
         HOST_FILLORDER=FILLORDER_LSB2MSB
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: lsb2msb" >&5
 $as_echo "lsb2msb" >&6; }
diff --git a/configure.ac b/configure.ac
index 6bc3a8d0..e3ed5ea1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -324,7 +324,7 @@ dnl Check the native cpu bit order.
 dnl ---------------------------------------------------------------------------
 AC_MSG_CHECKING([native cpu bit order])
 case "$target_cpu" in
-    i*86*)
+    i*86*|x86_64*)
         HOST_FILLORDER=FILLORDER_LSB2MSB
 	AC_MSG_RESULT([lsb2msb])
 	;;