diff -r 8c567e298d7f -r 57abff252556 lemon/cplex.cc
--- a/lemon/cplex.cc	Sat Oct 27 13:00:48 2018 +0200
+++ b/lemon/cplex.cc	Wed Jan 20 16:17:21 2021 +0100
@@ -158,7 +158,7 @@
     } else {
       const char s = 'R';
       double len = ub - lb;
-      CPXaddrows(cplexEnv(), _prob, 0, 1, values.size(), &ub, &s,
+      CPXaddrows(cplexEnv(), _prob, 0, 1, values.size(), &lb, &s,
                  &rmatbeg, &indices.front(), &values.front(), 0, 0);
       CPXchgrngval(cplexEnv(), _prob, 1, &i, &len);
     }