diff --git a/scripts/core/sxmo_audiocurrentdevice.sh b/scripts/core/sxmo_audiocurrentdevice.sh
index ddef734..f3e3134 100755
--- a/scripts/core/sxmo_audiocurrentdevice.sh
+++ b/scripts/core/sxmo_audiocurrentdevice.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env sh
-${SPEAKER:-"Line Out"}
-${HEADPHONE:-"Headphone"}
-${EARPIECE:-"Earpiece"}
+SPEAKER=${SPEAKER:-"Line Out"}
+HEADPHONE=${HEADPHONE:-"Headphone"}
+EARPIECE=${EARPIECE:-"Earpiece"}
 
 audiodevice() {
 	amixer sget "$EARPIECE" | grep -qE '\[on\]' && echo "$EARPIECE" && return
diff --git a/scripts/core/sxmo_audioout.sh b/scripts/core/sxmo_audioout.sh
index 310f307..a06e9b8 100755
--- a/scripts/core/sxmo_audioout.sh
+++ b/scripts/core/sxmo_audioout.sh
@@ -5,9 +5,9 @@ ARG="$1"
 # shellcheck source=scripts/core/sxmo_common.sh
 . "$(dirname "$0")/sxmo_common.sh"
 
-${SPEAKER:-"Line Out"}
-${HEADPHONE:-"Headphone"}
-${EARPIECE:-"Earpiece"}
+SPEAKER="${SPEAKER:-"Line Out"}"
+HEADPHONE="${HEADPHONE:-"Headphone"}"
+EARPIECE="${EARPIECE:-"Earpiece"}"
 
 amixer set "$SPEAKER" mute
 amixer set "$HEADPHONE" mute