diff --git a/mac/9term.app/Contents/MacOS/9term b/mac/9term.app/Contents/MacOS/9term
index b5a46bc89..04eb042c9 100755
--- a/mac/9term.app/Contents/MacOS/9term
+++ b/mac/9term.app/Contents/MacOS/9term
@@ -3,12 +3,16 @@ fshell=$(finger $(whoami) | sed -n 's/.*Shell: //p' | sed 1q)
 SHELL=${fshell:-$SHELL}
 PLAN9=${PLAN9:-/usr/local/plan9}
 cd $HOME
+arch=x86_64
+if arch -arch arm64 date >/dev/null 2>&1; then
+	arch=arm64
+fi
 case "$SHELL" in
 */rc)
 	echo '
 		if(! ~ $PLAN9/bin $path)
 			path=($path $PLAN9/bin)
-		$PLAN9/bin/9term -l -W600x800 &
+		arch -arch '$arch' $PLAN9/bin/9term -l -W600x800 &
 	' | $SHELL -l
 	exit 0
 	;;
@@ -24,6 +28,6 @@ if ! [[ :$PATH: =~ :$PLAN9/bin: ]]
 then
 	PATH=$PATH:$PLAN9/bin
 fi
-$PLAN9/bin/9term -l -W600x800 &
+arch -arch $arch $PLAN9/bin/9term -l -W600x800 &
 exit 0
 
diff --git a/mac/Plumb.app/Contents/MacOS/plumb b/mac/Plumb.app/Contents/MacOS/plumb
index 850ec0e00..b3f153302 100755
--- a/mac/Plumb.app/Contents/MacOS/plumb
+++ b/mac/Plumb.app/Contents/MacOS/plumb
@@ -3,6 +3,10 @@
 if [ -e ~/.bashrc ] ; then
 	. ~/.bashrc
 fi
+arch=x86_64
+if arch -arch arm64 date >/dev/null 2>&1; then
+	arch=arm64
+fi
 PLAN9=${PLAN9:-/usr/local/plan9}
 
 bin=$PLAN9/bin
@@ -10,5 +14,5 @@ IFS=$'\n'
 
 for file in $($bin/macargv)
 do
-	$bin/macedit "$file"
+	arch -arch $arch $bin/macedit "$file"
 done