diff --git a/lib/contracts.js b/lib/contracts.js
index 2aa12f57..0c648571 100644
--- a/lib/contracts.js
+++ b/lib/contracts.js
@@ -149,9 +149,7 @@ ContractsManager.prototype.build = function(done) {
         for (var j = 0; j < ref.length; j++) {
           var arg = ref[j];
           if (arg[0] === "$") {
-            if (self.contractDependencies[className] === void 0) {
-              self.contractDependencies[className] = [];
-            }
+            self.contractDependencies[className] = self.contractDependencies[className] || [];
             self.contractDependencies[className].push(arg.substr(1));
           }
         }