--- rrdtool-1.2.23-orig/src/rrd_graph.c	2007-05-02 20:06:10.000000000 +0200
+++ rrdtool-1.2.23/src/rrd_graph.c	2007-06-01 09:16:02.000000000 +0200
@@ -1461,6 +1461,7 @@
             prt_fctn != 'n' && /* a synonym for l */
             prt_fctn != 'r' &&
             prt_fctn != 'j' &&
+            prt_fctn != 'J' &&
             prt_fctn != 'c' &&
             prt_fctn != 's' &&
             prt_fctn != 't' &&