diff --git a/modhex.go b/modhex.go
index 74e15e6..198ceba 100644
--- a/modhex.go
+++ b/modhex.go
@@ -30,23 +30,23 @@ func EncodedLen(n int) int {
 // EncodedLen(len(src)).
 func Encode(dst, src []byte) int {
 	// keep track of the number of bytes written to dst
-	len := 0
+	n := 0
 
 	// convert each byte of src and store in dst
 	for _, v := range src {
 		// convert the upper nibble to modhex
 		// and store it into dst
-		dst[len] = modhexTable[v>>4]
-		len++
+		dst[n] = modhexTable[v>>4]
+		n++
 
 		// convert the lower nibble to modhex
 		// and store it into dst
-		dst[len] = modhexTable[v&0x0f]
-		len++
+		dst[n] = modhexTable[v&0x0f]
+		n++
 	}
 
 	// return the number of bytes written
-	return len
+	return n
 }
 
 // EncodeToString returns the modhex encoding of src as a string.