did you hold a valid work permit during your internship ?
Meaning it was not a study permit based work permit ( CO-OP)
if you had a individual work permit for the internship and they paid you, it counts !
It clearly states the following
Your work experience must be:
1) At least one year (1,560 hours total / 30 hours per week), continuous full-time or an equal amount in part-time,
2) Paid work (volunteer work, unpaid internships do not count),
3) In the same job,
4) Within the last 10 years, and
5) At skill type 0, or skill levels A or B of the 2011 National Occupational Classification (NOC).