I'm stunned, why does this code give me a segmentation fault?

#include <stdio.h>

#define LIMIT 1500000

typedef struct {
    int p;
    int a;
    int b;
} triplet;

int main(int argc, char **argv) { 
    int i;
    triplet triplets[LIMIT];

    for (i = 0; i < 5; i++) {
        triplets[i].p = 9; // remove this line and everything works fine
    }

    printf("%d\n", triplets[15].p);

    return 0; 
}

EDIT: After changing LIMIT to 150 I no longer get a segmentation fault, it prints random numbers instead.