diff --git a/nes/eznes.h b/nes/eznes.h
index 5a0db45..5958fa9 100644
--- a/nes/eznes.h
+++ b/nes/eznes.h
@@ -44,6 +44,7 @@
 static u16 _ez_entropy = 0;
 
 u16 ezrand() {
+  _ez_entropy = 1 + ((_ez_entropy >> 15) | (_ez_entropy << 1));
   return ((u16) rand()) ^ _ez_entropy;
 }