babycrackme.c has a minute fault when compiling with gcc

[XoxRumbleLorexoX]

babycrackme.c:43:16: warning: 'scanf' may overflow; destination buffer in argument 2 has size 64, but the corresponding specifier may require size 65 [-Wfortify-source]
        scanf("%64s", buffer);
                      ^
1 warning generated.