ArcGIS Random Point generator producing same points every iteration

I am generating random points to sample within a stratum. Data Management Tools > Feature Class > Generate Random Points This works just fine, except that I noticed the points I generated for sampling this year were exactly the same as last year. Every time I generate a new set of points, they are the same points each time.

Is there a setting that will fix this?

I am using ArcGIS Desktop 10.3.1.