diff --git a/lib/function/probability/distribution.js b/lib/function/probability/distribution.js
index 6155a4dde..a22570bd1 100644
--- a/lib/function/probability/distribution.js
+++ b/lib/function/probability/distribution.js
@@ -122,9 +122,10 @@ function factory (type, config, load, typed) {
             var max = 1;
             var res = _randomDataForMatrix(size.valueOf(), min, max, randFunc);
             return (size && size.isMatrix === true) ? matrix(res) : res;
+          } else {
+            var max = arg;
+            return randFunc(min, max);
           }
-
-          return randFunc(0, arg);
         },
         'function, number | Array, number': function(randFunc, arg1, arg2) {
           if (isCollection(arg1)) {
@@ -134,8 +135,11 @@ function factory (type, config, load, typed) {
             var res = _randomDataForMatrix(size.valueOf(), min, max, randFunc);
             return (size && size.isMatrix === true) ? matrix(res) : res;
           }
-
-          return randFunc(arg1, arg2);
+          else {
+            var min = arg1;
+            var max = arg2;
+            return randFunc(min, max);
+          }
         },
         'function, Array, number, number': function(randFunc, size, min, max) {
           var res = _randomDataForMatrix(size.valueOf(), min, max, randFunc);