diff --git a/src/util/to.h b/src/util/to.h
index c927d57..e3a4943 100644
--- a/src/util/to.h
+++ b/src/util/to.h
@@ -15,11 +15,11 @@ int tolli(const char *s, long long int min, long long int max, long long int *ou
 		return 0;\
 	}
 DEF_STR_TO_INT(tolu, unsigned long int, tollu, unsigned long long int, "lu")
+DEF_STR_TO_INT(tozu, size_t, tollu, unsigned long long int, "zu")
 DEF_STR_TO_INT(tou, unsigned int, tollu, unsigned long long int, "u")
 DEF_STR_TO_INT(toli, long int, tolli, long long int, "li")
 DEF_STR_TO_INT(toi, int, tolli, long long int, "i")
 #undef DEF_STR_TO_INT
-#define tozu tolu
 #define tozi toli
 #define toju tollu
 #define toji tolli