diff --git a/dotnet-tools.json b/dotnet-tools.json
index d81bfe9ae6d99..c6a27a88ac606 100644
--- a/dotnet-tools.json
+++ b/dotnet-tools.json
@@ -14,4 +14,4 @@
       ]
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs b/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs
index b6cff758fff1a..214b33631ba97 100644
--- a/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs
+++ b/src/Analyzers/CSharp/Tests/MakeFieldReadonly/MakeFieldReadonlyTests.cs
@@ -1705,6 +1705,23 @@ await TestInRegularAndScript1Async(
 {
     private volatile object first;
     private readonly object second;
+}");
+        }
+
+        [WorkItem(46785, "https://github.com/dotnet/roslyn/issues/46785")]
+        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/46785"), Trait(Traits.Feature, Traits.Features.CodeActionsMakeFieldReadonly)]
+        public async Task UsedAsRef_NoDiagnostic()
+        {
+            await TestMissingInRegularAndScriptAsync(
+@"public class C
+{
+    private string [|_x|] = string.Empty;
+
+    public bool M()
+    {
+        ref var myVar = ref x;
+        return myVar is null;
+    }
 }");
         }
     }