diff --git a/src/lib/es2015.collection.d.ts b/src/lib/es2015.collection.d.ts
index 9e27045a5592a..fd4a752cd57e9 100644
--- a/src/lib/es2015.collection.d.ts
+++ b/src/lib/es2015.collection.d.ts
@@ -64,7 +64,7 @@ interface WeakMap<K extends object, V> {
 }
 
 interface WeakMapConstructor {
-    new <K extends object = object, V = any>(entries?: readonly [K, V][] | null): WeakMap<K, V>;
+    new <K extends object = object, V = any>(entries?: readonly (readonly [K, V])[] | null): WeakMap<K, V>;
     readonly prototype: WeakMap<object, any>;
 }
 declare var WeakMap: WeakMapConstructor;
diff --git a/tests/baselines/reference/mapConstructorOnReadonlyTuple.js b/tests/baselines/reference/mapConstructorOnReadonlyTuple.js
index af2a3b20b4cb8..4e158e568e477 100644
--- a/tests/baselines/reference/mapConstructorOnReadonlyTuple.js
+++ b/tests/baselines/reference/mapConstructorOnReadonlyTuple.js
@@ -1,7 +1,10 @@
 //// [mapConstructorOnReadonlyTuple.ts]
-const pairs = [['1', 1], ['2', 2]] as const
-new Map(pairs);
+const pairs = [[{}, 1], [{}, 2]] as const;
+new Map(pairs);
+new WeakMap(pairs);
+
 
 //// [mapConstructorOnReadonlyTuple.js]
-const pairs = [['1', 1], ['2', 2]];
+const pairs = [[{}, 1], [{}, 2]];
 new Map(pairs);
+new WeakMap(pairs);
diff --git a/tests/baselines/reference/mapConstructorOnReadonlyTuple.symbols b/tests/baselines/reference/mapConstructorOnReadonlyTuple.symbols
index 29426a8ec8ddb..c577de5c9fd04 100644
--- a/tests/baselines/reference/mapConstructorOnReadonlyTuple.symbols
+++ b/tests/baselines/reference/mapConstructorOnReadonlyTuple.symbols
@@ -1,5 +1,5 @@
 === tests/cases/compiler/mapConstructorOnReadonlyTuple.ts ===
-const pairs = [['1', 1], ['2', 2]] as const
+const pairs = [[{}, 1], [{}, 2]] as const;
 >pairs : Symbol(pairs, Decl(mapConstructorOnReadonlyTuple.ts, 0, 5))
 >const : Symbol(const)
 
@@ -7,3 +7,7 @@ new Map(pairs);
 >Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
 >pairs : Symbol(pairs, Decl(mapConstructorOnReadonlyTuple.ts, 0, 5))
 
+new WeakMap(pairs);
+>WeakMap : Symbol(WeakMap, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>pairs : Symbol(pairs, Decl(mapConstructorOnReadonlyTuple.ts, 0, 5))
+
diff --git a/tests/baselines/reference/mapConstructorOnReadonlyTuple.types b/tests/baselines/reference/mapConstructorOnReadonlyTuple.types
index 44fc38fa797ab..8a024a3df84ab 100644
--- a/tests/baselines/reference/mapConstructorOnReadonlyTuple.types
+++ b/tests/baselines/reference/mapConstructorOnReadonlyTuple.types
@@ -1,17 +1,22 @@
 === tests/cases/compiler/mapConstructorOnReadonlyTuple.ts ===
-const pairs = [['1', 1], ['2', 2]] as const
->pairs : readonly [readonly ["1", 1], readonly ["2", 2]]
->[['1', 1], ['2', 2]] as const : readonly [readonly ["1", 1], readonly ["2", 2]]
->[['1', 1], ['2', 2]] : readonly [readonly ["1", 1], readonly ["2", 2]]
->['1', 1] : readonly ["1", 1]
->'1' : "1"
+const pairs = [[{}, 1], [{}, 2]] as const;
+>pairs : readonly [readonly [{}, 1], readonly [{}, 2]]
+>[[{}, 1], [{}, 2]] as const : readonly [readonly [{}, 1], readonly [{}, 2]]
+>[[{}, 1], [{}, 2]] : readonly [readonly [{}, 1], readonly [{}, 2]]
+>[{}, 1] : readonly [{}, 1]
+>{} : {}
 >1 : 1
->['2', 2] : readonly ["2", 2]
->'2' : "2"
+>[{}, 2] : readonly [{}, 2]
+>{} : {}
 >2 : 2
 
 new Map(pairs);
->new Map(pairs) : Map<"1" | "2", 1 | 2>
+>new Map(pairs) : Map<{}, 1 | 2>
 >Map : MapConstructor
->pairs : readonly [readonly ["1", 1], readonly ["2", 2]]
+>pairs : readonly [readonly [{}, 1], readonly [{}, 2]]
+
+new WeakMap(pairs);
+>new WeakMap(pairs) : WeakMap<{}, 1 | 2>
+>WeakMap : WeakMapConstructor
+>pairs : readonly [readonly [{}, 1], readonly [{}, 2]]
 
diff --git a/tests/cases/compiler/mapConstructorOnReadonlyTuple.ts b/tests/cases/compiler/mapConstructorOnReadonlyTuple.ts
index f4914e67def20..2aa2824f4cf82 100644
--- a/tests/cases/compiler/mapConstructorOnReadonlyTuple.ts
+++ b/tests/cases/compiler/mapConstructorOnReadonlyTuple.ts
@@ -1,4 +1,5 @@
 // @target: es2015
 
-const pairs = [['1', 1], ['2', 2]] as const
-new Map(pairs);
\ No newline at end of file
+const pairs = [[{}, 1], [{}, 2]] as const;
+new Map(pairs);
+new WeakMap(pairs);