diff --git a/fhem/FHEM/98_powerMap.pm b/fhem/FHEM/98_powerMap.pm
index cf4dfb0bf..34d9f9dba 100644
--- a/fhem/FHEM/98_powerMap.pm
+++ b/fhem/FHEM/98_powerMap.pm
@@ -1398,11 +1398,7 @@ sub powerMap_power($$$;$) {
         elsif ( looks_like_number($num) ) {
             my ( $val1, $val2 );
 
-            foreach (
-                sort { $powerMap->{$reading}{$a} <=> $powerMap->{$reading}{$b} }
-                keys( %{ $powerMap->{$reading} } )
-              )
-            {
+            foreach ( sort { $a <=> $b } keys( %{ $powerMap->{$reading} } ) ) {
                 next unless ( looks_like_number($_) );
                 $val1 = $_ if ( $_ < $num );
                 $val2 = $_ if ( $_ > $num );