diff --git a/system/bootchart/bootchart.SlackBuild b/system/bootchart/bootchart.SlackBuild
index b93b73e773..5a83e5b62c 100644
--- a/system/bootchart/bootchart.SlackBuild
+++ b/system/bootchart/bootchart.SlackBuild
@@ -10,10 +10,17 @@
 
 PRGNAM=bootchart		
 VERSION=${VERSION:-0.9}	
-ARCH=${ARCH:-i486}		
 BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
 CWD=$(pwd)
 TMP=${TMP:-/tmp/SBo}	
 PKG=$TMP/package-$PRGNAM