In c++ : Dynamically allocated array

I get this error (in visual studio) when deallocating the array (delete[] array). How do I fix it ?

Debug error: heap corruption detected: after normal block (#187) ... CRT detected that the application wrote to memory after end of heap buffer.

#include using namespace std;

int FibonacciNumber(int array[], int size) { array[0] = 0; array[1] = 1; for (int i = 2; i <= size; i++) { array[i] = array[i - 1] + array[i - 2]; } return array[size]; } void Fibonacci(int arr[], int size) { cout << FibonacciNumber(arr, size); }

int main(){ int size = 5; int* array = new int[size]; Fibonacci(array, size); delete[] array; // causes error return 0; }