diff --git a/lib/mysql.pm b/lib/mysql.pm
index 97460b9..fa3de7a 100644
--- a/lib/mysql.pm
+++ b/lib/mysql.pm
@@ -1240,10 +1240,18 @@ sub mysql_cgi {
 		push(@tmpz, "LINE1:B_in#00EE00");
 		if(lc($config->{netstats_in_bps}) eq "y") {
 			push(@CDEF, "CDEF:B_in=in,8,*");
-			push(@CDEF, "CDEF:B_out=out,8,*");
+			if(lc($config->{netstats_mode} || "") eq "separated") {
+				push(@CDEF, "CDEF:B_out=out,8,*,-1,*");
+			} else {
+				push(@CDEF, "CDEF:B_out=out,8,*");
+			}
 		} else {
 			push(@CDEF, "CDEF:B_in=in");
-			push(@CDEF, "CDEF:B_out=out");
+			if(lc($config->{netstats_mode} || "") eq "separated") {
+				push(@CDEF, "CDEF:B_out=out,-1,*");
+			} else {
+				push(@CDEF, "CDEF:B_out=out");
+			}
 		}
 		if(lc($config->{show_gaps}) eq "y") {
 			push(@tmp, "AREA:wrongdata#$colors->{gap}:");