diff --git a/plugins/battery/battery.plugin.sh b/plugins/battery/battery.plugin.sh
index 3b506bf..401845c 100644
--- a/plugins/battery/battery.plugin.sh
+++ b/plugins/battery/battery.plugin.sh
@@ -6,7 +6,7 @@ if ! command -v "command_exists" >/dev/null; then	command_exists() { command -v
 ac_adapter_connected(){
   if command_exists upower;
   then
-    upower -i $(upower -e | grep BAT) | grep 'state' | grep -q '[: \t]charging\|fully-charged'
+    upower -i $(upower -e | grep BAT) | grep 'state' | grep -q '[:[:blank:]]charging\|fully-charged'
     return $?
   elif command_exists acpi;
   then