1diff --git a/bin/rivet-cmphistos b/bin/rivet-cmphistos
2--- a/bin/rivet-cmphistos
3+++ b/bin/rivet-cmphistos
4@@ -371,7 +371,7 @@ if __name__ == '__main__':
5 # plot[key] = val
6 if plotoptions.has_key("PLOT"):
7 for key_val in plotoptions["PLOT"]:
8- key, val = [s.strip() for s in key_val.split("=")]
9+ key, val = [s.strip() for s in key_val.split("=", 1)]
10 plot[key] = val
11 if opts.LINEAR:
12 plot['LogY'] = '0'