diff --git a/73_AutoShuttersControl.pm b/73_AutoShuttersControl.pm
index a3a1689..e64a5f7 100644
--- a/73_AutoShuttersControl.pm
+++ b/73_AutoShuttersControl.pm
@@ -4449,7 +4449,7 @@ sub ASC_Debug {
 }
 
 sub _averageBrightness {
-    my @input = shift;
+    my @input = @_;
     use List::Util qw(sum);
 
     return int( sum(@input) / @input );