diff --git a/system/twin/twin.SlackBuild b/system/twin/twin.SlackBuild
index ab8c0045ff..d054fcb1a1 100644
--- a/system/twin/twin.SlackBuild
+++ b/system/twin/twin.SlackBuild
@@ -32,10 +32,10 @@ TAG=${TAG:-_SBo}
 # Automatically determine the architecture we're building on:
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
-    i?86) export ARCH=i486 ;;
-    arm*) export ARCH=arm ;;
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
     # Unless $ARCH is already set, use uname -m for all other archs:
-       *) export ARCH=$( uname -m ) ;;
+       *) ARCH=$( uname -m ) ;;
   esac
 fi