diff --git a/lodash.src.js b/lodash.src.js
index d8520b05b..f8832a5bd 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -4527,7 +4527,7 @@
       if (guard ? isIterateeCall(array, size, guard) : size == null) {
         size = 1;
       } else {
-        size = nativeMax(+size || 1, 1);
+        size = nativeMax(floor(size) || 1, 1);
       }
       var index = 0,
           length = array ? array.length : 0,
diff --git a/test/test.js b/test/test.js
index 0076944ba..9ac8952d3 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1846,6 +1846,10 @@
       deepEqual(actual, expected);
     });
 
+    test('should floor `size` values', 1, function() {
+      deepEqual(_.chunk(array, array.length / 4), [[0], [1], [2], [3], [4], [5]]);
+    });
+
     test('should work as an iteratee for methods like `_.map`', 1, function() {
       var actual = _.map([[1, 2], [3, 4]], _.chunk);
       deepEqual(actual, [[[1], [2]], [[3], [4]]]);