diff --git a/packages/apollo-server-caching/src/InMemoryLRUCache.ts b/packages/apollo-server-caching/src/InMemoryLRUCache.ts
index 2f3470c2005..719db2ba34a 100644
--- a/packages/apollo-server-caching/src/InMemoryLRUCache.ts
+++ b/packages/apollo-server-caching/src/InMemoryLRUCache.ts
@@ -6,7 +6,7 @@ export class InMemoryLRUCache implements KeyValueCache {
 
   // FIXME: Define reasonable default max size of the cache
   constructor({ maxSize = Infinity }: { maxSize?: number } = {}) {
-    this.store = LRU({
+    this.store = new LRU({
       max: maxSize,
       length: item => item.length,
     });