diff --git a/pipewire-jack/src/pw-jack.in b/pipewire-jack/src/pw-jack.in
index ee2fc7404..6376d448d 100755
--- a/pipewire-jack/src/pw-jack.in
+++ b/pipewire-jack/src/pw-jack.in
@@ -36,7 +36,7 @@ while getopts 'hr:vs:p:' param ; do
 			if [ x"$PIPEWIRE_DEBUG" = x ]; then
 				PIPEWIRE_DEBUG=3
 			else
-				PIPEWIRE_DEBUG=$(( $PIPEWIRE_DEBUG + 1 ))
+				PIPEWIRE_DEBUG=$(( PIPEWIRE_DEBUG + 1 ))
 			fi
 			export PIPEWIRE_DEBUG
 			;;
@@ -62,7 +62,7 @@ while getopts 'hr:vs:p:' param ; do
 	esac
 done
 
-shift $(( $OPTIND - 1 ))
+shift $(( OPTIND - 1 ))
 
 if [ x"$PERIOD" != x ]; then
 	PIPEWIRE_LATENCY="$PERIOD/$SAMPLERATE"