diff --git a/fhem/FHEM/47_OBIS.pm b/fhem/FHEM/47_OBIS.pm
index 2ad8d0c12..cfa7f705c 100644
--- a/fhem/FHEM/47_OBIS.pm
+++ b/fhem/FHEM/47_OBIS.pm
@@ -640,7 +640,7 @@ sub OBIS_Parse($$)
 			
 			# End of Message
 					if ($rmsg=~/^!.*/) {
-						$hash->{helper}{EoM}+=1 if ($hash->{helper}{DEVICES}[1]>0 // '');
+						$hash->{helper}{EoM}+=1 if (($hash->{helper}{DEVICES}[1] // 0)>0);
 					}
 			#Version
 					elsif ($rmsg=~ /.*\/(.*)/) {