diff --git a/lib/my/io/my_printf/flag_parser.c b/lib/my/io/my_printf/flag_parser.c
index 611a5fd..a251625 100644
--- a/lib/my/io/my_printf/flag_parser.c
+++ b/lib/my/io/my_printf/flag_parser.c
@@ -54,7 +54,7 @@ void get_flags(printf_t *pr, printf_args_t *arg)
     arg->flags = (struct flags_s){ 0 };
     get_simple_flags(pr, arg);
     if (IS_NUM(pr->format[pr->index]) || pr->format[pr->index] == '-') {
-        arg->flags.padding = my_strtol(pr->format + pr->index, NULL);
+        arg->flags.padding = my_strtol(pr->format + pr->index);
         arg->flags.padded = true;
         pr->index += (
             (int)my_nbr_len_base(arg->flags.padding, BASE_DEC)
@@ -72,7 +72,7 @@ bool get_precision(printf_t *pr, printf_args_t *arg)
     arg->precision = default_precision;
     if (pr->format[pr->index] != '.')
         return true;
-    tmp = my_strtol(pr->format + pr->index + 1, NULL);
+    tmp = my_strtol(pr->format + pr->index + 1);
     if (tmp <= 0 && pr->format[pr->index + 1] == '-')
         return false;
     pr->index += 1;
diff --git a/lib/my/std/convert_base.c b/lib/my/std/convert_base.c
index ea083f5..9008d17 100644
--- a/lib/my/std/convert_base.c
+++ b/lib/my/std/convert_base.c
@@ -9,5 +9,5 @@
 
 char *convert_base(char const *nbr, char const *base_from, char const *base_to)
 {
-    return my_nbr_to_base(my_strtol_base(nbr, NULL, base_from), base_to);
+    return my_nbr_to_base(my_strtol_base(nbr, base_from), base_to);
 }
diff --git a/lib/my/string.h b/lib/my/string.h
index ea64e88..6408b80 100644
--- a/lib/my/string.h
+++ b/lib/my/string.h
@@ -59,8 +59,8 @@ int my_showmem(char const *str, int size);
 int my_showstr(char const *str);
 int my_strcmp(char const *s1, char const *s2);
 int my_strncmp(char const *s1, char const *s2, size_t n);
-long my_strtol(const char *str, const char **endptr);
-long my_strtol_base(const char *str, const char **endptr, char const *base);
+long my_strtol(const char *str);
+long my_strtol_base(const char *str, char const *base);
 size_t my_memfind(const void *arr, const void *target, size_t n);
 size_t my_strlen(char const *str);
 size_t write_int_base(long long nbr, char const *base, char *buf);
diff --git a/lib/my/string/strtol.c b/lib/my/string/strtol.c
index b388895..2de1664 100644
--- a/lib/my/string/strtol.c
+++ b/lib/my/string/strtol.c
@@ -30,15 +30,15 @@ bool is_valid(char c, bool *negative, const char *base)
     return false;
 }
 
-long my_strtol_base(const char *str, const char **endptr, char const *base)
+long my_strtol_base(const char *str, char const *base)
 {
     long res = 0;
     long len = (long)my_strlen(base);
     bool negative = false;
     size_t i = 0;
 
-    if (str == NULL || len == 0)
-        return 0;
+    if (str == NULL || base == 0)
+        return INT64_MAX;
     for (; str[i]; i++) {
         if (!is_valid(str[i], &negative, base))
             break;
@@ -46,12 +46,12 @@ long my_strtol_base(const char *str, const char **endptr, char const *base)
             continue;
         res = res * len + -index_in(str[i], base);
     }
-    if (endptr != NULL)
-        *endptr = str + i;
+    if (str[i])
+        return INT64_MAX;
     return (negative) ? res : -res;
 }
 
-long my_strtol(const char *str, const char **endptr)
+long my_strtol(const char *str)
 {
-    return my_strtol_base(str, endptr, BASE_DEC);
+    return my_strtol_base(str, BASE_DEC);
 }
diff --git a/src/parser/parser.c b/src/parser/parser.c
index 072b3b3..691a240 100644
--- a/src/parser/parser.c
+++ b/src/parser/parser.c
@@ -38,10 +38,9 @@ int get_command(char *line, anthill_t *anthill)
 static
 int get_ants_num(char *line, anthill_t *anthill)
 {
-    const char *endptr;
-    long value = my_strtol(line, &endptr);
+    long value = my_strtol(line);
 
-    if (endptr == line)
+    if (value == INT64_MAX)
         return RET_ERROR;
     anthill->ants = value;
     anthill->step = ST_ROOMS;
diff --git a/src/parser/room.c b/src/parser/room.c
index a10dc8e..91cdbff 100644
--- a/src/parser/room.c
+++ b/src/parser/room.c
@@ -45,10 +45,10 @@ room_t *get_room_data(char *line)
     *ptr_x = '\0';
     *ptr_y = '\0';
     room.name = dup;
-    room.x = my_strtol(ptr_x + 1, NULL);
-    room.y = my_strtol(ptr_y + 1, NULL);
+    room.x = my_strtol(ptr_x + 1);
+    room.y = my_strtol(ptr_y + 1);
     room.type = ROOM_NORMAL;
-    if (line == ptr_x || ptr_x == ptr_y)
+    if (room.x == INT64_MAX || room.y == INT64_MAX)
         return NULL;
     return &room;
 }