diff --git a/src/base.h b/src/base.h
index dc54179..3cc23c4 100644
--- a/src/base.h
+++ b/src/base.h
@@ -47,8 +47,7 @@ typedef double f64;
 #define CELL_WIDTH    (WIDTH / (f64)CELL_ROW_SIZE)
 #define CELL_HEIGHT   (HEIGHT / (f64)CELL_ROW_SIZE)
 
-#define MUTATION_CHANCE 5000
-#define MUTATION_OFFSET 1
+#define MUTATION_CHANCE (SIMULATION_SIZE)
 
 #define DRAW_PROGRAM_OUTLINE 1