Daniel Antunez scored at home for Inter in Turku but early season strugglers FC Lahti got the better of the hosts Monday evening at Veritas Stadion.
FC Inter 1 - 3 FC Lahti
Antunez got the starting call in central midfield from head coach Job Dragtsma for the third match in a row and went the distance as Inter suffered their first defeat of the young campaign.
The California native notched his first Veikkausliiga goal after 31 minutes, off of a Mika Mäkitalo assist to put Inter ahead at the half.
The second half was a completely different story, however, thanks to Lahti's introduction of Finnish legend Jari Litmanen just before the halftime whistle.
The former Ajax star drew the terms level just eleven minutes into the second session, getting on the end of a Jarkko Värttö pass and connecting.
The 39 year old then turned provider, setting up Pekka Sihvola for the go ahead goal twelve minutes later.
Rafael finished off the guest's scoring flurry in the 73rd minute with help from substitute Jussi Länsitalo.
Inter are now in eigth place after three games while Lahti jump them into the seventh spot with the win, ahead only on goal differential.
VPS' American duo of Brian Pope and Greg Eckhardt remain sidelined by injuries and missed out on their team's 3-0 thumping at the hands of HJK Sunday.