The driver of a big rig was standing behind the truck when it somehow rolled back and pinned him between the truck and the loading dock.
The accident happened Monday morning at the REI at the River Park Shopping Center.
Police say the driver may have left the parking brake off or the brakes may have malfunctioned.
The passenger of the truck left to get coffee and pulled the truck off his partner.
The driver was taken to the hospital but his condition is not known at this time.