Code that finds only two primes

This code tries to collect the prime numbers from 2 to 30. It runs without errors, but the output is only [2, 3]. Move just one line so that it collects all the primes.

Code to fix

primes = []
is_prime = True
for n in range(2, 31):
    for i in range(2, n):
        if n % i == 0:
            is_prime = False
            break
    if is_prime:
        primes.append(n)
print(primes)