1 files changed, 3 insertions, 2 deletions
diff --git a/lib/auto.js b/lib/auto.js
index 0e9d108..ae3ecfc 100644
--- a/lib/auto.js
+++ b/lib/auto.js
@@ -10,6 +10,7 @@ import okeys from 'lodash/keys';
 import noop from 'lodash/noop';
 import once from 'lodash/once';
 import rest from 'lodash/rest';
+import onlyOnce from './internal/onlyOnce';
 
 import setImmediate from './internal/setImmediate';
 
@@ -60,7 +61,7 @@ export default function (tasks, concurrency, callback) {
     arrayEach(keys, function (k) {
         if (hasError) return;
         var task = isArray(tasks[k]) ? tasks[k]: [tasks[k]];
-        var taskCallback = rest(function(err, args) {
+        var taskCallback = onlyOnce(rest(function(err, args) {
             runningTasks--;
             if (args.length <= 1) {
                 args = args[0];
@@ -80,7 +81,7 @@ export default function (tasks, concurrency, callback) {
                 results[k] = args;
                 setImmediate(taskComplete);
             }
-        });
+        }));
 
         var requires = task.slice(0, task.length - 1);