diff --git a/volume b/volume
index e38eda4..791440f 100755
--- a/volume
+++ b/volume
@@ -1326,6 +1326,9 @@ main() {
 
     # PulseAudio sink flags
     declare -a SINK_FLAGS=()
+    
+    # PulseAudio port aliases
+    declare -A PORT_ALIASES
 
     # PulseAudio sink ports
     declare -gA SINK_PORTS