diff --git a/daemon/libnetwork/drivers/bridge/port_mapping_linux_test.go b/daemon/libnetwork/drivers/bridge/port_mapping_linux_test.go
index 7bf61a3113..b3637e7af3 100644
--- a/daemon/libnetwork/drivers/bridge/port_mapping_linux_test.go
+++ b/daemon/libnetwork/drivers/bridge/port_mapping_linux_test.go
@@ -1015,7 +1015,7 @@ func (pm *stubPortMapper) UnmapPorts(_ context.Context, reqs []portmapperapi.Por
 		if idx == -1 {
 			return fmt.Errorf("stubPortMapper.UnmapPorts: pb doesn't exist %v", req)
 		}
-		pm.mapped = slices.Delete(pm.mapped, idx, idx)
+		pm.mapped = slices.Delete(pm.mapped, idx, idx+1)
 	}
 	return nil
 }