diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index c0d5cae7bae..1e02da30c39 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -260,7 +260,7 @@ namespace ts {
             }
 
             clear(): void {
-                this.data = createDictionaryObject<T>();
+                this.data = createDictionaryObject<MapEntry<T>>();
                 this.size = 0;
 
                 // Reset the linked list. Note that we must adjust the forward