diff --git a/tests/cases/conformance/expressions/typeGuards/typeGuardsWithInstanceOfByConstructorSignature.ts b/tests/cases/conformance/expressions/typeGuards/typeGuardsWithInstanceOfByConstructorSignature.ts
index b81dd26652b0e..0817954c35c5c 100644
--- a/tests/cases/conformance/expressions/typeGuards/typeGuardsWithInstanceOfByConstructorSignature.ts
+++ b/tests/cases/conformance/expressions/typeGuards/typeGuardsWithInstanceOfByConstructorSignature.ts
@@ -13,7 +13,7 @@ if (obj1 instanceof A) { // narrowed to A.
 }
 
 var obj2: any;
-if (obj2 instanceof A) { // can't narrow type from 'any'
+if (obj2 instanceof A) {
     obj2.foo;
     obj2.bar;
 }
@@ -35,7 +35,7 @@ if (obj3 instanceof B) { // narrowed to B<number>.
 }
 
 var obj4: any;
-if (obj4 instanceof B) { // can't narrow type from 'any'
+if (obj4 instanceof B) {
     obj4.foo = "str";
     obj4.foo = 1;
     obj4.bar = "str";
@@ -67,7 +67,7 @@ if (obj5 instanceof C) { // narrowed to C1|C2.
 }
 
 var obj6: any;
-if (obj6 instanceof C) { // can't narrow type from 'any'
+if (obj6 instanceof C) {
     obj6.foo;
     obj6.bar1;
     obj6.bar2;
@@ -86,7 +86,7 @@ if (obj7 instanceof D) { // narrowed to D.
 }
 
 var obj8: any;
-if (obj8 instanceof D) { // can't narrow type from 'any'
+if (obj8 instanceof D) {
     obj8.foo;
     obj8.bar;
 }
@@ -113,7 +113,7 @@ if (obj9 instanceof E) { // narrowed to E1 | E2
 }
 
 var obj10: any;
-if (obj10 instanceof E) { // can't narrow type from 'any'
+if (obj10 instanceof E) {
     obj10.foo;
     obj10.bar1;
     obj10.bar2;
@@ -136,7 +136,7 @@ if (obj11 instanceof F) { // can't type narrowing, construct signature returns a
 }
 
 var obj12: any;
-if (obj12 instanceof F) { // can't narrow type from 'any'
+if (obj12 instanceof F) {
     obj12.foo;
     obj12.bar;
 }
@@ -161,7 +161,7 @@ if (obj13 instanceof G) { // narrowed to G1. G1 is return type of prototype prop
 }
 
 var obj14: any;
-if (obj14 instanceof G) { // can't narrow type from 'any'
+if (obj14 instanceof G) {
     obj14.foo1;
     obj14.foo2;
 }
@@ -183,7 +183,19 @@ if (obj15 instanceof H) { // narrowed to H.
 }
 
 var obj16: any;
-if (obj16 instanceof H) { // can't narrow type from 'any'
+if (obj16 instanceof H) {
     obj16.foo1;
     obj16.foo2;
 }
+
+var obj17: any;
+if (obj17 instanceof Object) { // can't narrow type from 'any' to 'Object'
+    obj17.foo1;
+    obj17.foo2;
+}
+
+var obj18: any;
+if (obj18 instanceof Function) { // can't narrow type from 'any' to 'Function'
+    obj18.foo1;
+    obj18.foo2;
+}