diff --git a/libraries/libast/libast.SlackBuild b/libraries/libast/libast.SlackBuild
index b3dadace3c..324f1c27d2 100644
--- a/libraries/libast/libast.SlackBuild
+++ b/libraries/libast/libast.SlackBuild
@@ -2,7 +2,7 @@
 
 # Slackware build script for libast
 
-# Copyright 2014 Dimitris Zlatanidis Greece-Orestiada
+# Copyright 2014-2016  Dimitris Zlatanidis  Orestiada, Greece
 # All rights reserved.
 #
 # Redistribution and use of this script, with or without modification, is
@@ -29,7 +29,7 @@ TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
-    i?86) ARCH=i486 ;;
+    i?86) ARCH=i586 ;;
     arm*) ARCH=arm ;;
        *) ARCH=$( uname -m ) ;;
   esac
@@ -40,8 +40,8 @@ TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
 
-if [ "$ARCH" = "i486" ]; then
-  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
   LIBDIRSUFFIX=""
 elif [ "$ARCH" = "i686" ]; then
   SLKCFLAGS="-O2 -march=i686 -mtune=i686"