diff --git a/FHEM/10_MAX.pm b/FHEM/10_MAX.pm
index 3d18a55e2..df0d9d6ca 100755
--- a/FHEM/10_MAX.pm
+++ b/FHEM/10_MAX.pm
@@ -98,8 +98,8 @@ MAX_DateTime2Internal($)
 sub
 MAX_TypeToTypeId($)
 {
-  while (my ($typeId, $type) = each (%device_types)) {
-    return $typeId if($_[0] eq $type);
+  foreach (keys %device_types) {
+    return $_ if($_[0] eq $device_types{$_});
   }
   Log 1, "MAX_TypeToTypeId: Invalid type $_[0]";
   return 0;