diff --git a/voice-client/files/lib/voice/intel.sh b/voice-client/files/lib/voice/intel.sh
index ae01f3dd6..13f756db4 100755
--- a/voice-client/files/lib/voice/intel.sh
+++ b/voice-client/files/lib/voice/intel.sh
@@ -14,12 +14,12 @@ getLineName() {
 }
 
 getSerial() {
-    sernum=$(fw_printenv -n serial_number) 2> /dev/null
+    sernum="$(fw_printenv -n serial_number 2> /dev/null)"
 
     if [ $? ]; then
-	echo 0
-    else
 	echo $sernum
+    else
+	echo 0
     fi
 }