diff --git a/academic/ncbi-blast/ncbi-blast.SlackBuild b/academic/ncbi-blast/ncbi-blast.SlackBuild
index 5004bcd266..0adf5cbdae 100644
--- a/academic/ncbi-blast/ncbi-blast.SlackBuild
+++ b/academic/ncbi-blast/ncbi-blast.SlackBuild
@@ -34,12 +34,16 @@ SRCNAM=blast
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
-    i?86) ARCH=i386 ;;
-    arm*) ARCH=arm ;;
+    i?86) ARCH=i586 ;;
        *) ARCH=$( uname -m ) ;;
   esac
 fi
 
+if ! [ "$ARCH" = "x86_64" ] && ! [[ $ARCH =~ i?86 ]]; then
+  printf "\n\n$ARCH is not supported... \n" >/dev/stderr
+  exit 1
+fi
+
 # If the variable PRINT_PACKAGE_NAME is set, then this script will report what
 # the name of the created package would be, and then exit. This information
 # could be useful to other scripts.
@@ -54,11 +58,6 @@ OUTPUT=${OUTPUT:-/tmp}
 
 set -e
 
-if [ "$ARCH" != "i386" ] && [ "$ARCH" != "x86_64" ]; then
-  printf "\n\n$ARCH is not supported... \n"
-  exit 1
-fi
-
 # Determine the source arch
 if [ "$ARCH" = "x86_64" ]; then
   SRCARCH="x64"