diff --git a/sim.c b/sim.c
index 471ab2f..812c570 100644
--- a/sim.c
+++ b/sim.c
@@ -651,7 +651,7 @@ BEGIN_OPERATOR(random)
   }
   Usz key = y * width + x;
   key = hash32_shift_mult((y * width + x) ^ (Tick_number << UINT32_C(16)));
-  Usz val = key % (max + 1 - min) + min;
+  Usz val = key % (max - min) + min;
   POKE(1, 0, glyph_of(val));
 END_OPERATOR