diff --git a/pyomo/contrib/fbbt/fbbt.py b/pyomo/contrib/fbbt/fbbt.py
index b8a2bf20c04..1b2fd0a18d9 100644
--- a/pyomo/contrib/fbbt/fbbt.py
+++ b/pyomo/contrib/fbbt/fbbt.py
@@ -1138,7 +1138,7 @@ def visiting_potential_leaf(self, node):
                     ub = interval.inf
                 if lb - self.feasibility_tol > ub:
                     raise InfeasibleConstraintException(
-                        'Variable has a lower bound which is larger than its upper bound: {0}'.format(
+                        'Variable has a lower bound that is larger than its upper bound: {0}'.format(
                             str(node)
                         )
                     )