diff --git a/examples/tests/SatSolverTests.cs b/examples/tests/SatSolverTests.cs
index d4f39a192d..2020183828 100644
--- a/examples/tests/SatSolverTests.cs
+++ b/examples/tests/SatSolverTests.cs
@@ -442,10 +442,9 @@ namespace Google.OrTools.Tests
             CpModel model = new CpModel();
             IntVar v = model.NewIntVar(-10, 10, "v");
             IntervalVar i = model.NewFixedSizeIntervalVar(v, 3, "i");
-            Console.WriteLine("Start = " + i.StartExpr().ToString() + "/" + i.StartExpr().ShortString());
-            Console.WriteLine("Size = " + i.SizeExpr().ToString() + "/" + i.SizeExpr().ShortString());
-            Console.WriteLine("End = " + i.EndExpr().ToString() + "/" + i.EndExpr().ShortString());
-            Console.WriteLine("Interval = " + i.ToString());
+            Assert.Equal("v", i.StartExpr().ShortString());
+            Assert.Equal("3", i.SizeExpr().ShortString());
+            Assert.Equal("(v + 3)", i.EndExpr().ShortString());
         }
     }
 } // namespace Google.OrTools.Tests
diff --git a/ortools/sat/csharp/IntegerExpressions.cs b/ortools/sat/csharp/IntegerExpressions.cs
index 2b199393be..f589b69098 100644
--- a/ortools/sat/csharp/IntegerExpressions.cs
+++ b/ortools/sat/csharp/IntegerExpressions.cs
@@ -379,7 +379,7 @@ namespace Google.OrTools.Sat
             long offset = proto.Offset;
             if (numElements == 0)
             {
-                return new ConstantExpr(offset);
+                return LinearExpr.Constant(offset);
             }
             else 
             if (numElements == 1)