Code not reaching statements using fgets?

I have written code that uses the fgets function with multiple conditions that call other functions within the code, namely aMethod and bMethod.

int main(void) {
char buffer[1024];
while (fgets(buffer, 1024, stdin)) {
    if ((strcasecmp(buffer,"a")) == 0) {
        aMethod();
        }
    if ((strcasecmp(buffer, "b")) == 0) {
        bMethod();
        }
    }
}

I'm not sure why it doesn't reach the if statements. Any help would be great, thankyou.