diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index 4c20d00bc..066917393 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -2075,7 +2075,7 @@ AssignIoPort($;$)
   # Set the I/O device, search for the last compatible one.
   for my $p (sort { $defs{$b}{NR} <=> $defs{$a}{NR} } keys %defs) {
 
-    next if(IsDisabled($p) != 1);
+    next if(IsDisabled($p) == 1);
     my $cl = $defs{$p}{Clients};
     $cl = $modules{$defs{$p}{TYPE}}{Clients} if(!$cl);