diff --git a/lib/square.js b/lib/square.js
index <HASH>..<HASH> 100644
--- a/lib/square.js
+++ b/lib/square.js
@@ -1183,6 +1183,7 @@ Square.prototype.build = function build(platform, extensions, fn) {
   extensions = args.array || Object.keys(this.package.meta.extensions);
 
   // @TODO loop over all platforms we are building against.
+  this.cache.start();
   this.reduce(platform, extensions, reduced);
 };
[minor] Start the cache when we build.