diff --git a/cmd/treatment/main.go b/cmd/treatment/main.go
index 7baa380f..845247a6 100644
--- a/cmd/treatment/main.go
+++ b/cmd/treatment/main.go
@@ -328,7 +328,7 @@ func setChannels(mode string, l logging.Logger) error {
 
 // setVolume sends i2c commands to the amplifier in order to set the volume of the amplifier.
 func setVolume(hexVol string, bus embd.I2CBus) error {
-	vol, err := strconv.ParseInt(hexVol, 16, 8)
+	vol, err := strconv.ParseInt(hexVol, 10, 8)
 	if err != nil {
 		return fmt.Errorf("could not parse hex volume: %w", err)
 	}