diff --git a/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs b/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs
index 811f51493f746..9a7d768db6754 100644
--- a/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs
+++ b/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs
@@ -1717,13 +1717,13 @@ await TestInRegularAndScript1Async(
         }
 
         [WorkItem(46785, "https://github.com/dotnet/roslyn/issues/46785")]
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/46785"), Trait(Traits.Feature, Traits.Features.CodeActionsMakeFieldReadonly)]
+        [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeFieldReadonly)]
         public async Task UsedAsRef_NoDiagnostic()
         {
             await TestMissingInRegularAndScriptAsync(
 @"public class C
 {
-    private string [|_x|] = string.Empty;
+    private string [|x|] = string.Empty;
 
     public bool M()
     {
@@ -1733,6 +1733,26 @@ public bool M()
 }");
         }
 
+        [WorkItem(57983, "https://github.com/dotnet/roslyn/issues/57983")]
+        [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeFieldReadonly)]
+        public async Task UsedAsRef_NoDiagnostic_02()
+        {
+            await TestMissingInRegularAndScriptAsync(
+@"using System.Runtime.CompilerServices;
+
+public class Test
+{
+    private ulong [|nextD3D12ComputeFenceValue|];
+
+    internal void Repro()
+    {
+        ref ulong d3D12FenceValue = ref Unsafe.NullRef<ulong>();
+        d3D12FenceValue = ref nextD3D12ComputeFenceValue;
+        d3D12FenceValue++;
+    }
+}");
+        }
+
         [WorkItem(42760, "https://github.com/dotnet/roslyn/issues/42760")]
         [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsMakeFieldReadonly)]
         public async Task WithThreadStaticAttribute_NoDiagnostic()
diff --git a/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Extensions/OperationExtensions.cs b/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Extensions/OperationExtensions.cs
index 800e930574599..3bde34e3df8b5 100644
--- a/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Extensions/OperationExtensions.cs
+++ b/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Extensions/OperationExtensions.cs
@@ -126,6 +126,12 @@ INegatedPatternOperation or
                     ? ValueUsageInfo.ReadWrite
                     : ValueUsageInfo.Write;
             }
+            else if (operation.Parent is ISimpleAssignmentOperation simpleAssignmentOperation &&
+                simpleAssignmentOperation.Value == operation &&
+                simpleAssignmentOperation.IsRef)
+            {
+                return ValueUsageInfo.ReadableWritableReference;
+            }
             else if (operation.Parent is IIncrementOrDecrementOperation)
             {
                 return ValueUsageInfo.ReadWrite;