diff --git a/random/mersennetwister.js b/random/mersennetwister.js
index 21257f1..5fc3b39 100644
--- a/random/mersennetwister.js
+++ b/random/mersennetwister.js
@@ -81,6 +81,6 @@ function MersenneTwister()
   };
 
   this.genrand_real2 = function () {
-    return this.genrand_int32() * (1.0 / 4294967296.0);
+    return this.int32() * (1.0 / 4294967296.0);
   }
 }