diff --git a/lib/convert.js b/lib/convert.js
index 18d52cd..8176c5e 100644
--- a/lib/convert.js
+++ b/lib/convert.js
@@ -860,7 +860,7 @@ module.exports = function convert(config) {
             }
 
             if (node.name.kind === SyntaxKind.Identifier && node.questionToken) {
-                result.key.optional = true;
+                result.optional = true;
             }
 
             if (node.exclamationToken) {
diff --git a/tests/ast-alignment/fixtures-to-test.js b/tests/ast-alignment/fixtures-to-test.js
index c4ba689..9af8d16 100644
--- a/tests/ast-alignment/fixtures-to-test.js
+++ b/tests/ast-alignment/fixtures-to-test.js
@@ -399,8 +399,6 @@ let fixturePatternConfigsToTest = [
             "type-alias-declaration",
             "type-alias-object-without-annotation",
             "typed-this",
-            "class-with-optional-properties",
-            "class-with-optional-property-undefined",
             "export-type-function-declaration",
             "export-type-class-declaration",
             "abstract-interface",
diff --git a/tests/lib/__snapshots__/typescript.js.snap b/tests/lib/__snapshots__/typescript.js.snap
index 176b601..9424f52 100644
--- a/tests/lib/__snapshots__/typescript.js.snap
+++ b/tests/lib/__snapshots__/typescript.js.snap
@@ -13337,7 +13337,6 @@ Object {
                 },
               },
               "name": "foo",
-              "optional": true,
               "range": Array [
                 14,
                 17,
@@ -13354,6 +13353,7 @@ Object {
                 "line": 2,
               },
             },
+            "optional": true,
             "range": Array [
               14,
               19,
@@ -13376,7 +13376,6 @@ Object {
                 },
               },
               "name": "bar",
-              "optional": true,
               "range": Array [
                 22,
                 25,
@@ -13393,6 +13392,7 @@ Object {
                 "line": 3,
               },
             },
+            "optional": true,
             "range": Array [
               22,
               36,
@@ -13450,7 +13450,6 @@ Object {
                 },
               },
               "name": "baz",
-              "optional": true,
               "range": Array [
                 47,
                 50,
@@ -13467,6 +13466,7 @@ Object {
                 "line": 4,
               },
             },
+            "optional": true,
             "range": Array [
               39,
               61,
@@ -13928,7 +13928,6 @@ Object {
                 },
               },
               "name": "foo",
-              "optional": true,
               "range": Array [
                 20,
                 23,
@@ -13945,6 +13944,7 @@ Object {
                 "line": 2,
               },
             },
+            "optional": true,
             "range": Array [
               12,
               37,