A breakaway coupling for connecting two fluid lines, comprising a first coupling part (3) which can be connected to the first fluid line and a second coupling part (4) which can be connected to the second fluid line. The coupling parts (3, 4) can be disconnected from one another by way of a defined disconnecting force, wherein at least one of the coupling parts (3, 4) has an outflow prevention valve (20) with a valve seat (21) and with a sealing body (14) which is configured for interaction with the valve seat (21). The outflow prevention valve (20) has a hold-open element (16) which is configured to enable a passage of the fluid in the joined-together state of the coupling parts (3, 4). The outflow prevention valve (20) is configured to prevent an outflow of the fluid from at least one of the fluid lines in the disconnected state of the coupling parts (3, 4). The breakaway coupling has an anti-rotation safeguard which, during operation of the coupling, prevents a rotation of the first coupling part (3) and the second coupling part (4) with respect to one another. According to the invention, the valve seat (21) has a bearing surface (24) for the sealing body (14), wherein a compensatory element (25) is arranged in the region of the bearing surface (24), which compensatory element (25) consists of a material which has a lower hardness than the material of the valve seat (21) and/or than the material of the sealing body (14).