diff --git a/volume-pulseaudio/volume-pulseaudio b/volume-pulseaudio/volume-pulseaudio
index 3ff7cbf..2ecc5d6 100755
--- a/volume-pulseaudio/volume-pulseaudio
+++ b/volume-pulseaudio/volume-pulseaudio
@@ -126,7 +126,7 @@ function print_format {
 
 function print_block {
     ACTIVE=$(pacmd list-sinks | grep "state\: RUNNING" -B4 -A7 | grep "index:\|name:\|volume: \(front\|mono\)\|muted:")
-    [ -z "$ACTIVE" ] && ACTIVE=$(pacmd list-sinks | grep "index:\|name:\|volume: \(front\|mono\)\|muted:" | grep -A3 '*')
+    [[ -z "$ACTIVE" ]] && ACTIVE=$(pacmd list-sinks | grep "index:\|name:\|volume: \(front\|mono\)\|muted:" | grep -A3 '*')
     for name in INDEX NAME VOL MUTED; do
         read $name
     done < <(echo "$ACTIVE")