diff --git a/src/common/xirand.h b/src/common/xirand.h
index ef16a6ebe81..3c55ff31f5e 100644
--- a/src/common/xirand.h
+++ b/src/common/xirand.h
@@ -24,8 +24,8 @@
 #define _XIRAND_H_
 
 // You can choose an RNG by commenting/uncommenting this line. The default is Mersenne Twister in 32 bit.
-#include "rng/mersennetwister.h"
-// #include "rng/mersennetwister64.h"
+// #include "rng/mersennetwister.h"
+#include "rng/mersennetwister64.h"
 // #include "rng/pcg.h"
 // #include "rng/pcg64.h"