diff --git a/20230413/4/main.c b/20230413/4/main.c
index 4d527cf02755f08f3f1db7f1b8bd2b1bbda5f40f..f5878da4dba5d79648f187d9295aa809f5e092e0 100644
--- a/20230413/4/main.c
+++ b/20230413/4/main.c
@@ -12,7 +12,7 @@ typedef struct {
 
 Person person_read(FILE *f) {
     Person person;
-    char format[4 + 1 + 4 + 1 + 3];
+    char format[4 + 1 + 4 + 1 + 3 + 1];
     sprintf(
         format, "%%%zus %%%zus %%hu",
         ARR_LEN(person.first_name),