diff --git a/lib/run.js b/lib/run.js
index fac94f48..5cc977a7 100644
--- a/lib/run.js
+++ b/lib/run.js
@@ -56,7 +56,7 @@ exports.runSync = function(cmd, args, options) {
   }, options));
   if (child.error) {
     throw child.error;
-  } else if (child.stderr.length) {
+  } else if (child.status !== 0) {
     throw new Error(child.stderr.toString());
   } else {
     return child.stdout.toString();