diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 26c27cb3be2..de7e9a9387f 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -4929,7 +4929,7 @@ namespace ts {
         }
 
         function getApparentTypeOfIntersectionType(type: IntersectionType) {
-            return type.resolvedIndexType || (type.resolvedApparentType = getTypeWithThisArgument(type, type));
+            return type.resolvedApparentType || (type.resolvedApparentType = getTypeWithThisArgument(type, type));
         }
 
         /**
diff --git a/tests/baselines/reference/keyofAndIndexedAccess.js b/tests/baselines/reference/keyofAndIndexedAccess.js
index 62b848e97df..2b1b22d3595 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess.js
+++ b/tests/baselines/reference/keyofAndIndexedAccess.js
@@ -526,6 +526,33 @@ class Form<T> {
         this.childFormFactories[prop](value)
     }
 }
+
+// Repro from #13787
+
+class SampleClass<P> {
+    public props: Readonly<P>;
+    constructor(props: P) {
+        this.props = Object.freeze(props);
+    }
+}
+
+interface Foo {
+    foo: string;
+}
+
+declare function merge<T, U>(obj1: T, obj2: U): T & U;
+
+class AnotherSampleClass<T> extends SampleClass<T & Foo> {
+    constructor(props: T) {
+        const foo: Foo = { foo: "bar" };
+        super(merge(props, foo));
+    }
+
+    public brokenMethod() {
+        this.props.foo.concat;
+    }
+}
+new AnotherSampleClass({});
 
 
 //// [keyofAndIndexedAccess.js]
@@ -881,6 +908,27 @@ var Form = (function () {
     };
     return Form;
 }());
+// Repro from #13787
+var SampleClass = (function () {
+    function SampleClass(props) {
+        this.props = Object.freeze(props);
+    }
+    return SampleClass;
+}());
+var AnotherSampleClass = (function (_super) {
+    __extends(AnotherSampleClass, _super);
+    function AnotherSampleClass(props) {
+        var _this = this;
+        var foo = { foo: "bar" };
+        _this = _super.call(this, merge(props, foo)) || this;
+        return _this;
+    }
+    AnotherSampleClass.prototype.brokenMethod = function () {
+        this.props.foo.concat;
+    };
+    return AnotherSampleClass;
+}(SampleClass));
+new AnotherSampleClass({});
 
 
 //// [keyofAndIndexedAccess.d.ts]
@@ -1127,3 +1175,15 @@ declare class Form<T> {
     private childFormFactories;
     set<K extends keyof T>(prop: K, value: T[K]): void;
 }
+declare class SampleClass<P> {
+    props: Readonly<P>;
+    constructor(props: P);
+}
+interface Foo {
+    foo: string;
+}
+declare function merge<T, U>(obj1: T, obj2: U): T & U;
+declare class AnotherSampleClass<T> extends SampleClass<T & Foo> {
+    constructor(props: T);
+    brokenMethod(): void;
+}
diff --git a/tests/baselines/reference/keyofAndIndexedAccess.symbols b/tests/baselines/reference/keyofAndIndexedAccess.symbols
index 54fff19f428..f6425b5ed0e 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess.symbols
+++ b/tests/baselines/reference/keyofAndIndexedAccess.symbols
@@ -1880,3 +1880,86 @@ class Form<T> {
     }
 }
 
+// Repro from #13787
+
+class SampleClass<P> {
+>SampleClass : Symbol(SampleClass, Decl(keyofAndIndexedAccess.ts, 526, 1))
+>P : Symbol(P, Decl(keyofAndIndexedAccess.ts, 530, 18))
+
+    public props: Readonly<P>;
+>props : Symbol(SampleClass.props, Decl(keyofAndIndexedAccess.ts, 530, 22))
+>Readonly : Symbol(Readonly, Decl(lib.d.ts, --, --))
+>P : Symbol(P, Decl(keyofAndIndexedAccess.ts, 530, 18))
+
+    constructor(props: P) {
+>props : Symbol(props, Decl(keyofAndIndexedAccess.ts, 532, 16))
+>P : Symbol(P, Decl(keyofAndIndexedAccess.ts, 530, 18))
+
+        this.props = Object.freeze(props);
+>this.props : Symbol(SampleClass.props, Decl(keyofAndIndexedAccess.ts, 530, 22))
+>this : Symbol(SampleClass, Decl(keyofAndIndexedAccess.ts, 526, 1))
+>props : Symbol(SampleClass.props, Decl(keyofAndIndexedAccess.ts, 530, 22))
+>Object.freeze : Symbol(ObjectConstructor.freeze, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>Object : Symbol(Object, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>freeze : Symbol(ObjectConstructor.freeze, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>props : Symbol(props, Decl(keyofAndIndexedAccess.ts, 532, 16))
+    }
+}
+
+interface Foo {
+>Foo : Symbol(Foo, Decl(keyofAndIndexedAccess.ts, 535, 1))
+
+    foo: string;
+>foo : Symbol(Foo.foo, Decl(keyofAndIndexedAccess.ts, 537, 15))
+}
+
+declare function merge<T, U>(obj1: T, obj2: U): T & U;
+>merge : Symbol(merge, Decl(keyofAndIndexedAccess.ts, 539, 1))
+>T : Symbol(T, Decl(keyofAndIndexedAccess.ts, 541, 23))
+>U : Symbol(U, Decl(keyofAndIndexedAccess.ts, 541, 25))
+>obj1 : Symbol(obj1, Decl(keyofAndIndexedAccess.ts, 541, 29))
+>T : Symbol(T, Decl(keyofAndIndexedAccess.ts, 541, 23))
+>obj2 : Symbol(obj2, Decl(keyofAndIndexedAccess.ts, 541, 37))
+>U : Symbol(U, Decl(keyofAndIndexedAccess.ts, 541, 25))
+>T : Symbol(T, Decl(keyofAndIndexedAccess.ts, 541, 23))
+>U : Symbol(U, Decl(keyofAndIndexedAccess.ts, 541, 25))
+
+class AnotherSampleClass<T> extends SampleClass<T & Foo> {
+>AnotherSampleClass : Symbol(AnotherSampleClass, Decl(keyofAndIndexedAccess.ts, 541, 54))
+>T : Symbol(T, Decl(keyofAndIndexedAccess.ts, 543, 25))
+>SampleClass : Symbol(SampleClass, Decl(keyofAndIndexedAccess.ts, 526, 1))
+>T : Symbol(T, Decl(keyofAndIndexedAccess.ts, 543, 25))
+>Foo : Symbol(Foo, Decl(keyofAndIndexedAccess.ts, 535, 1))
+
+    constructor(props: T) {
+>props : Symbol(props, Decl(keyofAndIndexedAccess.ts, 544, 16))
+>T : Symbol(T, Decl(keyofAndIndexedAccess.ts, 543, 25))
+
+        const foo: Foo = { foo: "bar" };
+>foo : Symbol(foo, Decl(keyofAndIndexedAccess.ts, 545, 13))
+>Foo : Symbol(Foo, Decl(keyofAndIndexedAccess.ts, 535, 1))
+>foo : Symbol(foo, Decl(keyofAndIndexedAccess.ts, 545, 26))
+
+        super(merge(props, foo));
+>super : Symbol(SampleClass, Decl(keyofAndIndexedAccess.ts, 526, 1))
+>merge : Symbol(merge, Decl(keyofAndIndexedAccess.ts, 539, 1))
+>props : Symbol(props, Decl(keyofAndIndexedAccess.ts, 544, 16))
+>foo : Symbol(foo, Decl(keyofAndIndexedAccess.ts, 545, 13))
+    }
+
+    public brokenMethod() {
+>brokenMethod : Symbol(AnotherSampleClass.brokenMethod, Decl(keyofAndIndexedAccess.ts, 547, 5))
+
+        this.props.foo.concat;
+>this.props.foo.concat : Symbol(String.concat, Decl(lib.d.ts, --, --))
+>this.props.foo : Symbol(foo)
+>this.props : Symbol(SampleClass.props, Decl(keyofAndIndexedAccess.ts, 530, 22))
+>this : Symbol(AnotherSampleClass, Decl(keyofAndIndexedAccess.ts, 541, 54))
+>props : Symbol(SampleClass.props, Decl(keyofAndIndexedAccess.ts, 530, 22))
+>foo : Symbol(foo)
+>concat : Symbol(String.concat, Decl(lib.d.ts, --, --))
+    }
+}
+new AnotherSampleClass({});
+>AnotherSampleClass : Symbol(AnotherSampleClass, Decl(keyofAndIndexedAccess.ts, 541, 54))
+
diff --git a/tests/baselines/reference/keyofAndIndexedAccess.types b/tests/baselines/reference/keyofAndIndexedAccess.types
index e987ee9043b..86469efc284 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess.types
+++ b/tests/baselines/reference/keyofAndIndexedAccess.types
@@ -2204,3 +2204,94 @@ class Form<T> {
     }
 }
 
+// Repro from #13787
+
+class SampleClass<P> {
+>SampleClass : SampleClass<P>
+>P : P
+
+    public props: Readonly<P>;
+>props : Readonly<P>
+>Readonly : Readonly<T>
+>P : P
+
+    constructor(props: P) {
+>props : P
+>P : P
+
+        this.props = Object.freeze(props);
+>this.props = Object.freeze(props) : Readonly<P>
+>this.props : Readonly<P>
+>this : this
+>props : Readonly<P>
+>Object.freeze(props) : Readonly<P>
+>Object.freeze : { <T>(a: T[]): ReadonlyArray<T>; <T extends Function>(f: T): T; <T>(o: T): Readonly<T>; }
+>Object : ObjectConstructor
+>freeze : { <T>(a: T[]): ReadonlyArray<T>; <T extends Function>(f: T): T; <T>(o: T): Readonly<T>; }
+>props : P
+    }
+}
+
+interface Foo {
+>Foo : Foo
+
+    foo: string;
+>foo : string
+}
+
+declare function merge<T, U>(obj1: T, obj2: U): T & U;
+>merge : <T, U>(obj1: T, obj2: U) => T & U
+>T : T
+>U : U
+>obj1 : T
+>T : T
+>obj2 : U
+>U : U
+>T : T
+>U : U
+
+class AnotherSampleClass<T> extends SampleClass<T & Foo> {
+>AnotherSampleClass : AnotherSampleClass<T>
+>T : T
+>SampleClass : SampleClass<T & Foo>
+>T : T
+>Foo : Foo
+
+    constructor(props: T) {
+>props : T
+>T : T
+
+        const foo: Foo = { foo: "bar" };
+>foo : Foo
+>Foo : Foo
+>{ foo: "bar" } : { foo: string; }
+>foo : string
+>"bar" : "bar"
+
+        super(merge(props, foo));
+>super(merge(props, foo)) : void
+>super : typeof SampleClass
+>merge(props, foo) : T & Foo
+>merge : <T, U>(obj1: T, obj2: U) => T & U
+>props : T
+>foo : Foo
+    }
+
+    public brokenMethod() {
+>brokenMethod : () => void
+
+        this.props.foo.concat;
+>this.props.foo.concat : (...strings: string[]) => string
+>this.props.foo : (T & Foo)["foo"]
+>this.props : Readonly<T & Foo>
+>this : this
+>props : Readonly<T & Foo>
+>foo : (T & Foo)["foo"]
+>concat : (...strings: string[]) => string
+    }
+}
+new AnotherSampleClass({});
+>new AnotherSampleClass({}) : AnotherSampleClass<{}>
+>AnotherSampleClass : typeof AnotherSampleClass
+>{} : {}
+
diff --git a/tests/cases/conformance/types/keyof/keyofAndIndexedAccess.ts b/tests/cases/conformance/types/keyof/keyofAndIndexedAccess.ts
index a8a5acd450f..70b70dff6ea 100644
--- a/tests/cases/conformance/types/keyof/keyofAndIndexedAccess.ts
+++ b/tests/cases/conformance/types/keyof/keyofAndIndexedAccess.ts
@@ -527,3 +527,30 @@ class Form<T> {
         this.childFormFactories[prop](value)
     }
 }
+
+// Repro from #13787
+
+class SampleClass<P> {
+    public props: Readonly<P>;
+    constructor(props: P) {
+        this.props = Object.freeze(props);
+    }
+}
+
+interface Foo {
+    foo: string;
+}
+
+declare function merge<T, U>(obj1: T, obj2: U): T & U;
+
+class AnotherSampleClass<T> extends SampleClass<T & Foo> {
+    constructor(props: T) {
+        const foo: Foo = { foo: "bar" };
+        super(merge(props, foo));
+    }
+
+    public brokenMethod() {
+        this.props.foo.concat;
+    }
+}
+new AnotherSampleClass({});