diff --git a/src/initMeta.js b/src/initMeta.js
index c0c045c..e0c36cd 100644
--- a/src/initMeta.js
+++ b/src/initMeta.js
@@ -7,8 +7,8 @@ const PROPS = [
 ]
 module.exports = (ob, options) => ob
     .requestContentLength(options)
-    .map((x) => {
-      const threads = splitRange(x, options.range)
-      return _.assign({}, options, {totalBytes: x, threads, offsets: threads.map((x) => x[0])})
+    .map((totalBytes) => {
+      const threads = splitRange(totalBytes, options.range)
+      return _.assign({}, options, {totalBytes, threads, offsets: threads.map((x) => x[0])})
     })
     .map((x) => _.pick(x, PROPS))
diff --git a/src/splitRange.js b/src/splitRange.js
index f11b8ab..c0cdcb5 100644
--- a/src/splitRange.js
+++ b/src/splitRange.js
@@ -5,11 +5,14 @@
 'use strict'
 const _ = require('lodash')
 
-module.exports = (range, count) => {
-  const delta = Math.round(range / count)
-  const start = _.times(count, (x) => x * delta)
-  const end = _.times(count, (x) => (x + 1) * delta - 1)
-  end[count - 1] = range
-  return _.zip(start, end)
+module.exports = (totalBytes, range) => {
+  if (range > 0) {
+    const delta = Math.round(totalBytes / range)
+    const start = _.times(range, (x) => x * delta)
+    const end = _.times(range, (x) => (x + 1) * delta - 1)
+    end[range - 1] = totalBytes
+    return _.zip(start, end)
+  }
+  return [[0, totalBytes]]
 }
 
diff --git a/test/test.splitRange.js b/test/test.splitRange.js
index 13b0112..af2ed15 100644
--- a/test/test.splitRange.js
+++ b/test/test.splitRange.js
@@ -10,3 +10,9 @@ test((t) => {
   t.same(splitRange(100, 2), [[0, 49], [50, 100]])
   t.same(splitRange(100, 3), [[0, 32], [33, 65], [66, 100]])
 })
+
+test.only('invalid values', (t) => {
+  t.same(splitRange(100, 0), [[0, 100]])
+  t.same(splitRange(100, null), [[0, 100]])
+  t.same(splitRange(100, NaN), [[0, 100]])
+})