diff --git a/FHEM/37_dash_dhcp.pm b/FHEM/37_dash_dhcp.pm
index c4b0364d7..dd918568d 100644
--- a/FHEM/37_dash_dhcp.pm
+++ b/FHEM/37_dash_dhcp.pm
@@ -169,7 +169,7 @@ dash_dhcp_Parse($$;$)
     $chaddr = '<empty>' if( !$chaddr );
     Log3 $name, 2, "$name: invalid mac: $chaddr";
 
-  } elsif( !$allowed || ",$allowed," =~/,$chaddr,/ ) {
+  } elsif( !$allowed || ",$allowed," =~/,$chaddr,/i ) {
     Log3 $name, 4, "$name: got $chaddr";
 
     $chaddr =~ s/:/-/g;