diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index ec3e815758..d55f3650c1 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -2179,7 +2179,7 @@ namespace ts {
                     return bindPropertyWorker(node as JSDocRecordMember);
                 case SyntaxKind.JSDocPropertyTag:
                     return declareSymbolAndAddToSymbolTable(node as JSDocPropertyTag,
-                        (node as JSDocPropertyTag).typeExpression && (node as JSDocPropertyTag).typeExpression.type.kind === SyntaxKind.JSDocOptionalType ?
+                        (node as JSDocPropertyTag).isBracketed || ((node as JSDocPropertyTag).typeExpression && (node as JSDocPropertyTag).typeExpression.type.kind === SyntaxKind.JSDocOptionalType) ?
                             SymbolFlags.Property | SymbolFlags.Optional : SymbolFlags.Property,
                         SymbolFlags.PropertyExcludes);
                 case SyntaxKind.JSDocFunctionType:
diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 04209ab092..07d4a9ada4 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -6631,10 +6631,7 @@ namespace ts {
                     });
                 }
 
-                function parseParamTag(atToken: AtToken, tagName: Identifier) {
-                    let typeExpression = tryParseTypeExpression();
-                    skipWhitespace();
-
+                function parseBracketNameInPropertyAndParamTag() {
                     let name: Identifier;
                     let isBracketed: boolean;
                     // Looking for something like '[foo]' or 'foo'
@@ -6653,6 +6650,14 @@ namespace ts {
                     else if (tokenIsIdentifierOrKeyword(token())) {
                         name = parseJSDocIdentifierName();
                     }
+                    return { name, isBracketed };
+                }
+
+                function parseParamTag(atToken: AtToken, tagName: Identifier) {
+                    let typeExpression = tryParseTypeExpression();
+                    skipWhitespace();
+
+                    const { name, isBracketed } = parseBracketNameInPropertyAndParamTag();
 
                     if (!name) {
                         parseErrorAtPosition(scanner.getStartPos(), 0, Diagnostics.Identifier_expected);
@@ -6709,8 +6714,9 @@ namespace ts {
                 function parsePropertyTag(atToken: AtToken, tagName: Identifier): JSDocPropertyTag {
                     const typeExpression = tryParseTypeExpression();
                     skipWhitespace();
-                    const name = parseJSDocIdentifierName();
+                    const { name, isBracketed } = parseBracketNameInPropertyAndParamTag();
                     skipWhitespace();
+
                     if (!name) {
                         parseErrorAtPosition(scanner.getStartPos(), /*length*/ 0, Diagnostics.Identifier_expected);
                         return undefined;
@@ -6721,6 +6727,7 @@ namespace ts {
                     result.tagName = tagName;
                     result.name = name;
                     result.typeExpression = typeExpression;
+                    result.isBracketed = isBracketed;
                     return finishNode(result);
                 }
 
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index c295a4c956..cc71bd7b42 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2146,6 +2146,7 @@ namespace ts {
         kind: SyntaxKind.JSDocPropertyTag;
         name: Identifier;
         typeExpression: JSDocTypeExpression;
+        isBracketed: boolean;
     }
 
     export interface JSDocTypeLiteral extends JSDocType {
diff --git a/tests/baselines/reference/checkJsdocTypedefInParamTag1.js b/tests/baselines/reference/checkJsdocTypedefInParamTag1.js
index 28d6a96b3f..d4983bfd58 100644
--- a/tests/baselines/reference/checkJsdocTypedefInParamTag1.js
+++ b/tests/baselines/reference/checkJsdocTypedefInParamTag1.js
@@ -4,6 +4,8 @@
  * @typedef {Object} Opts
  * @property {string} x
  * @property {string=} y
+ * @property {string} [z]
+ * @property {string} [w="hi"]
  * 
  * @param {Opts} opts
  */
@@ -17,6 +19,8 @@ foo({x: 'abc'});
  * @typedef {Object} Opts
  * @property {string} x
  * @property {string=} y
+ * @property {string} [z]
+ * @property {string} [w="hi"]
  *
  * @param {Opts} opts
  */
diff --git a/tests/baselines/reference/checkJsdocTypedefInParamTag1.symbols b/tests/baselines/reference/checkJsdocTypedefInParamTag1.symbols
index 19672d6e52..cd2455797b 100644
--- a/tests/baselines/reference/checkJsdocTypedefInParamTag1.symbols
+++ b/tests/baselines/reference/checkJsdocTypedefInParamTag1.symbols
@@ -4,14 +4,16 @@
  * @typedef {Object} Opts
  * @property {string} x
  * @property {string=} y
+ * @property {string} [z]
+ * @property {string} [w="hi"]
  * 
  * @param {Opts} opts
  */
 function foo(opts) {}
 >foo : Symbol(foo, Decl(0.js, 0, 0))
->opts : Symbol(opts, Decl(0.js, 8, 13))
+>opts : Symbol(opts, Decl(0.js, 10, 13))
 
 foo({x: 'abc'});
 >foo : Symbol(foo, Decl(0.js, 0, 0))
->x : Symbol(x, Decl(0.js, 10, 5))
+>x : Symbol(x, Decl(0.js, 12, 5))
 
diff --git a/tests/baselines/reference/checkJsdocTypedefInParamTag1.types b/tests/baselines/reference/checkJsdocTypedefInParamTag1.types
index ff30e8da8a..cc923e3303 100644
--- a/tests/baselines/reference/checkJsdocTypedefInParamTag1.types
+++ b/tests/baselines/reference/checkJsdocTypedefInParamTag1.types
@@ -4,16 +4,18 @@
  * @typedef {Object} Opts
  * @property {string} x
  * @property {string=} y
+ * @property {string} [z]
+ * @property {string} [w="hi"]
  * 
  * @param {Opts} opts
  */
 function foo(opts) {}
->foo : (opts: { x: string; y?: string; }) => void
->opts : { x: string; y?: string; }
+>foo : (opts: { x: string; y?: string; z?: string; w?: string; }) => void
+>opts : { x: string; y?: string; z?: string; w?: string; }
 
 foo({x: 'abc'});
 >foo({x: 'abc'}) : void
->foo : (opts: { x: string; y?: string; }) => void
+>foo : (opts: { x: string; y?: string; z?: string; w?: string; }) => void
 >{x: 'abc'} : { x: string; }
 >x : string
 >'abc' : "abc"
diff --git a/tests/cases/conformance/jsdoc/checkJsdocTypedefInParamTag1.ts b/tests/cases/conformance/jsdoc/checkJsdocTypedefInParamTag1.ts
index 261ce070cf..80ca21bd4f 100644
--- a/tests/cases/conformance/jsdoc/checkJsdocTypedefInParamTag1.ts
+++ b/tests/cases/conformance/jsdoc/checkJsdocTypedefInParamTag1.ts
@@ -7,6 +7,8 @@
  * @typedef {Object} Opts
  * @property {string} x
  * @property {string=} y
+ * @property {string} [z]
+ * @property {string} [w="hi"]
  * 
  * @param {Opts} opts
  */