2 files changed, 5 insertions, 2 deletions
diff --git a/lib/internal/eachOfLimit.js b/lib/internal/eachOfLimit.js
index ae153b1..2928366 100644
--- a/lib/internal/eachOfLimit.js
+++ b/lib/internal/eachOfLimit.js
@@ -9,7 +9,10 @@ import breakLoop from './breakLoop';
 export default function _eachOfLimit(limit) {
     return function (obj, iteratee, callback) {
         callback = once(callback || noop);
-        if (limit <= 0 || !obj) {
+        if (limit <= 0) {
+            throw new RangeError('concurrency limit cannot be less than 1')
+        }
+        if (!obj) {
             return callback(null);
         }
         var nextElem = iterator(obj);
diff --git a/lib/internal/queue.js b/lib/internal/queue.js
index 575497b..a421d2e 100644
--- a/lib/internal/queue.js
+++ b/lib/internal/queue.js
@@ -9,7 +9,7 @@ export default function queue(worker, concurrency, payload) {
         concurrency = 1;
     }
     else if(concurrency === 0) {
-        throw new Error('Concurrency must not be zero');
+        throw new RangeError('Concurrency must not be zero');
     }
 
     var _worker = wrapAsync(worker);