diff --git a/README.md b/README.md
index ad31eae..d66e1d1 100644
--- a/README.md
+++ b/README.md
@@ -157,6 +157,22 @@ To:
 
 Also removes trailing commas from object types.
 
+### Optional properties
+
+```js
+/**
+ * @type {{a: number, b?: string}}
+ */
+```
+
+To:
+
+```js
+/**
+ * @type {{a: number, b: string}}
+ */
+```
+
 ### TS inline function syntax
 
 ```js
diff --git a/index.js b/index.js
index 416eb4d..24401a8 100644
--- a/index.js
+++ b/index.js
@@ -546,6 +546,17 @@ exports.defineTags = function (dictionary) {
           case '\\':
             // Skip escaped character
             ++i;
+            break;
+          case '?':
+            // Remove optional property question marks
+            if (
+              !isWithinString &&
+              openCurly > 1 &&
+              /^\s*:/.test(tagText.slice(i + 1))
+            ) {
+              replacements.push([i, i + 1, '']);
+            }
+
             break;
           case '"':
           case "'":
diff --git a/test/dest/expected.json b/test/dest/expected.json
index f17fd3a..6261209 100644
--- a/test/dest/expected.json
+++ b/test/dest/expected.json
@@ -742,14 +742,110 @@
     "params": []
   },
   {
-    "comment": "/**\n * {@link module:test/sub/NumberStore~NumberStore NumberStore}\n */",
+    "comment": "/** @type {{ foo?: string; bar: string?, baz ? : string? }} */",
     "meta": {
       "range": [
-        1424,
-        1456
+        1456,
+        1521
+      ],
+      "filename": "index.js",
+      "lineno": 65,
+      "columnno": 0,
+      "code": {
+        "name": "exports.optionalProperties",
+        "type": "VariableDeclaration"
+      }
+    },
+    "type": {
+      "names": [
+        "Object"
+      ]
+    },
+    "name": "optionalProperties",
+    "longname": "module:test.optionalProperties",
+    "kind": "constant",
+    "memberof": "module:test",
+    "scope": "static"
+  },
+  {
+    "comment": "",
+    "meta": {
+      "range": [
+        1469,
+        1520
+      ],
+      "filename": "index.js",
+      "lineno": 65,
+      "columnno": 13,
+      "code": {
+        "name": "optionalProperties",
+        "type": "ObjectExpression",
+        "value": "{\"foo\":\"bar\",\"bar\":null}"
+      }
+    },
+    "undocumented": true,
+    "name": "optionalProperties",
+    "longname": "module:test~optionalProperties",
+    "kind": "constant",
+    "scope": "inner",
+    "memberof": "module:test",
+    "params": []
+  },
+  {
+    "comment": "",
+    "meta": {
+      "range": [
+        1494,
+        1504
+      ],
+      "filename": "index.js",
+      "lineno": 66,
+      "columnno": 2,
+      "code": {
+        "name": "foo",
+        "type": "Literal",
+        "value": "bar"
+      }
+    },
+    "undocumented": true,
+    "name": "foo",
+    "longname": "module:test~optionalProperties.foo",
+    "kind": "member",
+    "memberof": "module:test~optionalProperties",
+    "scope": "static"
+  },
+  {
+    "comment": "",
+    "meta": {
+      "range": [
+        1508,
+        1517
       ],
       "filename": "index.js",
       "lineno": 67,
+      "columnno": 2,
+      "code": {
+        "name": "bar",
+        "type": "Literal",
+        "value": null
+      }
+    },
+    "undocumented": true,
+    "name": "bar",
+    "longname": "module:test~optionalProperties.bar",
+    "kind": "member",
+    "memberof": "module:test~optionalProperties",
+    "scope": "static"
+  },
+  {
+    "comment": "/**\n * {@link module:test/sub/NumberStore~NumberStore NumberStore}\n */",
+    "meta": {
+      "range": [
+        1554,
+        1586
+      ],
+      "filename": "index.js",
+      "lineno": 73,
       "columnno": 0,
       "code": {
         "name": "exports.Link",
@@ -767,11 +863,11 @@
     "comment": "",
     "meta": {
       "range": [
-        1437,
-        1455
+        1567,
+        1585
       ],
       "filename": "index.js",
-      "lineno": 67,
+      "lineno": 73,
       "columnno": 13,
       "code": {
         "name": "Link",
@@ -791,11 +887,11 @@
     "comment": "/**\n * {@link module:test/sub/NumberStore~NumberStore Num}\n */",
     "meta": {
       "range": [
-        1493,
-        1533
+        1623,
+        1663
       ],
       "filename": "index.js",
-      "lineno": 72,
+      "lineno": 78,
       "columnno": 0,
       "code": {
         "name": "exports.LinkWithText",
@@ -813,11 +909,11 @@
     "comment": "",
     "meta": {
       "range": [
-        1506,
-        1532
+        1636,
+        1662
       ],
       "filename": "index.js",
-      "lineno": 72,
+      "lineno": 78,
       "columnno": 13,
       "code": {
         "name": "LinkWithText",
@@ -837,11 +933,11 @@
     "comment": "/**\n * {@link module:test/sub/NumberStore~NumberStore NumberStore.getNumber}\n */",
     "meta": {
       "range": [
-        1576,
-        1626
+        1706,
+        1756
       ],
       "filename": "index.js",
-      "lineno": 77,
+      "lineno": 83,
       "columnno": 0,
       "code": {
         "name": "exports.LinkWithMemberAccessor",
@@ -859,11 +955,11 @@
     "comment": "",
     "meta": {
       "range": [
-        1589,
-        1625
+        1719,
+        1755
       ],
       "filename": "index.js",
-      "lineno": 77,
+      "lineno": 83,
       "columnno": 13,
       "code": {
         "name": "LinkWithMemberAccessor",
@@ -883,11 +979,11 @@
     "comment": "/**\n * {@link module:test/sub/NumberStore~NumberStore Num}\n */",
     "meta": {
       "range": [
-        1673,
-        1730
+        1803,
+        1860
       ],
       "filename": "index.js",
-      "lineno": 82,
+      "lineno": 88,
       "columnno": 0,
       "code": {
         "name": "exports.LinkWithMemberAccessorAndText",
@@ -905,11 +1001,11 @@
     "comment": "",
     "meta": {
       "range": [
-        1686,
-        1729
+        1816,
+        1859
       ],
       "filename": "index.js",
-      "lineno": 82,
+      "lineno": 88,
       "columnno": 13,
       "code": {
         "name": "LinkWithMemberAccessorAndText",
diff --git a/test/src/index.js b/test/src/index.js
index 17307f3..65f9114 100644
--- a/test/src/index.js
+++ b/test/src/index.js
@@ -61,6 +61,12 @@ export const bracketNotation = 1;
 /** @type {[number, [number, string], "[number, boolean]"]} */
 export const nesteedTuples = [1, [1, 'a'], '[number, boolean]'];
 
+/** @type {{ foo?: string; bar: string?, baz ? : string? }} */
+export const optionalProperties = {
+  foo: 'bar',
+  bar: null,
+};
+
 /**
  * {@link NumberStore}
  */