diff -r 736a341e604b -r eba5aa390aca lemon/cplex.cc
--- a/lemon/cplex.cc	Thu Jan 21 08:36:53 2021 +0100
+++ b/lemon/cplex.cc	Thu Jan 21 18:58:37 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);
     }