diff --git a/day2/src/p1.c b/day2/src/p1.c
index ff44597..3158bee 100644
--- a/day2/src/p1.c
+++ b/day2/src/p1.c
@@ -7,7 +7,7 @@
 
 #include <result.h>
 
-#define RIMAX_STR 48
+#define RIMAX_STR (64 - sizeof(size_t))
 
 struct proc {
 	result_t mv;