diff --git a/cmd/rv/main.go b/cmd/rv/main.go
index b189b906..53b91346 100644
--- a/cmd/rv/main.go
+++ b/cmd/rv/main.go
@@ -317,8 +317,6 @@ func readPin(p *turbidityProbe, rv *revid.Revid, l *logger.Logger) func(pin *net
 				l.Debug("setting contrast pin", "contrast", p.contrast)
 				pin.Value = int(p.contrast * 100)
 			}
-		default:
-			pin.Value = -1
 		}
 		return nil
 	}