diff --git a/lib/package.js b/lib/package.js
index fa9f7a115..74356642a 100644
--- a/lib/package.js
+++ b/lib/package.js
@@ -670,9 +670,12 @@ exports.download = function(pkg, options, depsCallback) {
           Object.keys(depRanges.peerDeps).forEach(function(dep) {
             rangeMap.peerDependencies[dep] = depRanges.peerDeps[dep].exactName;
           });
-          postloadResolve(depRanges);
           fs.writeFileSync(cacheDir + '.deps.json', JSON.stringify(rangeMap, null, 2));
           fs.writeFileSync(path.resolve(cacheDir, '.jspm-hash'), fullHash + newLine + cfgHash);
+
+          // postloadResolve creates a promise so we need to return null for Bluebird warnings
+          postloadResolve(depRanges);
+          return null;
         });
       })