diff --git a/src/lib/core.d.ts b/src/lib/core.d.ts
index 7f498488f2136..5abc7fe203747 100644
--- a/src/lib/core.d.ts
+++ b/src/lib/core.d.ts
@@ -822,6 +822,7 @@ interface RegExp {
 declare var RegExp: {
     new (pattern: string, flags?: string): RegExp;
     (pattern: string, flags?: string): RegExp;
+    prototype: RegExp;
 
     // Non-standard extensions
     $1: string;
diff --git a/src/lib/extensions.d.ts b/src/lib/extensions.d.ts
index 82cc129ecbc08..f4387543c01aa 100644
--- a/src/lib/extensions.d.ts
+++ b/src/lib/extensions.d.ts
@@ -631,6 +631,7 @@ interface Map<K, V> {
 }
 declare var Map: {
     new <K, V>(): Map<K, V>;
+    prototype: Map<any, any>;
 }
 
 interface WeakMap<K, V> {
@@ -642,6 +643,7 @@ interface WeakMap<K, V> {
 }
 declare var WeakMap: {
     new <K, V>(): WeakMap<K, V>;
+    prototype: WeakMap<any, any>;
 }
 
 interface Set<T> {
@@ -654,6 +656,7 @@ interface Set<T> {
 }
 declare var Set: {
     new <T>(): Set<T>;
+    prototype: Set<any>;
 }
 
 declare module Intl {
diff --git a/tests/baselines/reference/constDeclarationShadowedByVarDeclaration3.types b/tests/baselines/reference/constDeclarationShadowedByVarDeclaration3.types
index 89490567f1449..3e688cc7674a7 100644
--- a/tests/baselines/reference/constDeclarationShadowedByVarDeclaration3.types
+++ b/tests/baselines/reference/constDeclarationShadowedByVarDeclaration3.types
@@ -7,7 +7,7 @@ class Rule {
 >regex : RegExp
 >RegExp : RegExp
 >new RegExp('') : RegExp
->RegExp : { (pattern: string, flags?: string): RegExp; new (pattern: string, flags?: string): RegExp; $1: string; $2: string; $3: string; $4: string; $5: string; $6: string; $7: string; $8: string; $9: string; lastMatch: string; }
+>RegExp : { (pattern: string, flags?: string): RegExp; new (pattern: string, flags?: string): RegExp; prototype: RegExp; $1: string; $2: string; $3: string; $4: string; $5: string; $6: string; $7: string; $8: string; $9: string; lastMatch: string; }
 
     public name: string = '';
 >name : string