diff --git a/csharp/ql/test/library-tests/dataflow/operators/Operator.cs b/csharp/ql/test/library-tests/dataflow/operators/Operator.cs
index 5db1a82b9a4..0b6aa2e8f90 100644
--- a/csharp/ql/test/library-tests/dataflow/operators/Operator.cs
+++ b/csharp/ql/test/library-tests/dataflow/operators/Operator.cs
@@ -120,3 +120,36 @@ public class CompoundAssignmentOperators
         Sink(x.Field); // $ hasValueFlow=1
     }
 }
+
+public class MutatorOperators
+{
+    static void Sink(object o) { }
+    static T Source<T>(object source) => throw null;
+
+    public class C1
+    {
+        public object Field { get; private set; }
+
+        public C1()
+        {
+            Field = new object();
+        }
+
+        public C1(object o)
+        {
+            Field = o;
+        }
+
+        public void operator ++()
+        {
+            Field = Source<object>(1);
+        }
+
+        public void M1()
+        {
+            var x = new C1();
+            x++;
+            Sink(x.Field); // $ hasValueFlow=1
+        }
+    }
+}
diff --git a/csharp/ql/test/library-tests/dataflow/operators/operatorFlow.expected b/csharp/ql/test/library-tests/dataflow/operators/operatorFlow.expected
index 8fd12f1c2a8..dc1ec8b71f4 100644
--- a/csharp/ql/test/library-tests/dataflow/operators/operatorFlow.expected
+++ b/csharp/ql/test/library-tests/dataflow/operators/operatorFlow.expected
@@ -130,6 +130,16 @@ edges
 | Operator.cs:119:14:119:14 | access to local variable y : C [property Field] : Object | Operator.cs:119:9:119:9 | [post] access to local variable x : C [property Field] : Object | provenance |  |
 | Operator.cs:120:14:120:14 | access to local variable x : C [property Field] : Object | Operator.cs:120:14:120:20 | access to property Field | provenance |  |
 | Operator.cs:120:14:120:14 | access to local variable x : C [property Field] : Object | Operator.cs:120:14:120:20 | access to property Field | provenance |  |
+| Operator.cs:143:30:143:31 | this [Return] : C1 [property Field] : Object | Operator.cs:151:13:151:13 | [post] access to local variable x : C1 [property Field] : Object | provenance |  |
+| Operator.cs:143:30:143:31 | this [Return] : C1 [property Field] : Object | Operator.cs:151:13:151:13 | [post] access to local variable x : C1 [property Field] : Object | provenance |  |
+| Operator.cs:145:13:145:17 | [post] this access : C1 [property Field] : Object | Operator.cs:143:30:143:31 | this [Return] : C1 [property Field] : Object | provenance |  |
+| Operator.cs:145:13:145:17 | [post] this access : C1 [property Field] : Object | Operator.cs:143:30:143:31 | this [Return] : C1 [property Field] : Object | provenance |  |
+| Operator.cs:145:21:145:37 | call to method Source<Object> : Object | Operator.cs:145:13:145:17 | [post] this access : C1 [property Field] : Object | provenance |  |
+| Operator.cs:145:21:145:37 | call to method Source<Object> : Object | Operator.cs:145:13:145:17 | [post] this access : C1 [property Field] : Object | provenance |  |
+| Operator.cs:151:13:151:13 | [post] access to local variable x : C1 [property Field] : Object | Operator.cs:152:18:152:18 | access to local variable x : C1 [property Field] : Object | provenance |  |
+| Operator.cs:151:13:151:13 | [post] access to local variable x : C1 [property Field] : Object | Operator.cs:152:18:152:18 | access to local variable x : C1 [property Field] : Object | provenance |  |
+| Operator.cs:152:18:152:18 | access to local variable x : C1 [property Field] : Object | Operator.cs:152:18:152:24 | access to property Field | provenance |  |
+| Operator.cs:152:18:152:18 | access to local variable x : C1 [property Field] : Object | Operator.cs:152:18:152:24 | access to property Field | provenance |  |
 nodes
 | Operator.cs:9:39:9:39 | x : C | semmle.label | x : C |
 | Operator.cs:9:39:9:39 | x : C | semmle.label | x : C |
@@ -275,6 +285,18 @@ nodes
 | Operator.cs:120:14:120:14 | access to local variable x : C [property Field] : Object | semmle.label | access to local variable x : C [property Field] : Object |
 | Operator.cs:120:14:120:20 | access to property Field | semmle.label | access to property Field |
 | Operator.cs:120:14:120:20 | access to property Field | semmle.label | access to property Field |
+| Operator.cs:143:30:143:31 | this [Return] : C1 [property Field] : Object | semmle.label | this [Return] : C1 [property Field] : Object |
+| Operator.cs:143:30:143:31 | this [Return] : C1 [property Field] : Object | semmle.label | this [Return] : C1 [property Field] : Object |
+| Operator.cs:145:13:145:17 | [post] this access : C1 [property Field] : Object | semmle.label | [post] this access : C1 [property Field] : Object |
+| Operator.cs:145:13:145:17 | [post] this access : C1 [property Field] : Object | semmle.label | [post] this access : C1 [property Field] : Object |
+| Operator.cs:145:21:145:37 | call to method Source<Object> : Object | semmle.label | call to method Source<Object> : Object |
+| Operator.cs:145:21:145:37 | call to method Source<Object> : Object | semmle.label | call to method Source<Object> : Object |
+| Operator.cs:151:13:151:13 | [post] access to local variable x : C1 [property Field] : Object | semmle.label | [post] access to local variable x : C1 [property Field] : Object |
+| Operator.cs:151:13:151:13 | [post] access to local variable x : C1 [property Field] : Object | semmle.label | [post] access to local variable x : C1 [property Field] : Object |
+| Operator.cs:152:18:152:18 | access to local variable x : C1 [property Field] : Object | semmle.label | access to local variable x : C1 [property Field] : Object |
+| Operator.cs:152:18:152:18 | access to local variable x : C1 [property Field] : Object | semmle.label | access to local variable x : C1 [property Field] : Object |
+| Operator.cs:152:18:152:24 | access to property Field | semmle.label | access to property Field |
+| Operator.cs:152:18:152:24 | access to property Field | semmle.label | access to property Field |
 subpaths
 | Operator.cs:29:17:29:17 | access to local variable x : C | Operator.cs:16:38:16:38 | x : C | Operator.cs:16:49:16:49 | access to parameter x : C | Operator.cs:29:17:29:21 | call to operator + : C |
 | Operator.cs:29:17:29:17 | access to local variable x : C | Operator.cs:16:38:16:38 | x : C | Operator.cs:16:49:16:49 | access to parameter x : C | Operator.cs:29:17:29:21 | call to operator + : C |
@@ -308,3 +330,5 @@ testFailures
 | Operator.cs:78:14:78:14 | (...) ... | Operator.cs:84:17:84:29 | call to method Source<C> : C | Operator.cs:78:14:78:14 | (...) ... | $@ | Operator.cs:84:17:84:29 | call to method Source<C> : C | call to method Source<C> : C |
 | Operator.cs:120:14:120:20 | access to property Field | Operator.cs:116:23:116:39 | call to method Source<Object> : Object | Operator.cs:120:14:120:20 | access to property Field | $@ | Operator.cs:116:23:116:39 | call to method Source<Object> : Object | call to method Source<Object> : Object |
 | Operator.cs:120:14:120:20 | access to property Field | Operator.cs:116:23:116:39 | call to method Source<Object> : Object | Operator.cs:120:14:120:20 | access to property Field | $@ | Operator.cs:116:23:116:39 | call to method Source<Object> : Object | call to method Source<Object> : Object |
+| Operator.cs:152:18:152:24 | access to property Field | Operator.cs:145:21:145:37 | call to method Source<Object> : Object | Operator.cs:152:18:152:24 | access to property Field | $@ | Operator.cs:145:21:145:37 | call to method Source<Object> : Object | call to method Source<Object> : Object |
+| Operator.cs:152:18:152:24 | access to property Field | Operator.cs:145:21:145:37 | call to method Source<Object> : Object | Operator.cs:152:18:152:24 | access to property Field | $@ | Operator.cs:145:21:145:37 | call to method Source<Object> : Object | call to method Source<Object> : Object |