diff --git a/cmd/makeosc/makeosc.go b/cmd/makeosc/makeosc.go
index 57da1ff..0ab2d93 100644
--- a/cmd/makeosc/makeosc.go
+++ b/cmd/makeosc/makeosc.go
@@ -117,7 +117,7 @@ func slipEncode(bytes []byte) []byte {
 	ESC_END := byte(0xdc)
 	ESC_ESC := byte(0xdd)
 
-	var encodedBytes = []byte{}
+	var encodedBytes = []byte{END}
 
 	for _, byteToEncode := range bytes {
 		if byteToEncode == END {