diff --git a/device/noise-helpers.go b/device/noise-helpers.go
index 03e6ec6..f5e4b4b 100644
--- a/device/noise-helpers.go
+++ b/device/noise-helpers.go
@@ -42,7 +42,6 @@ func HMAC2(sum *[blake2s.Size]byte, key, in0, in1 []byte) {
 func KDF1(t0 *[blake2s.Size]byte, key, input []byte) {
 	HMAC1(t0, key, input)
 	HMAC1(t0, t0[:], []byte{0x1})
-	return
 }
 
 func KDF2(t0, t1 *[blake2s.Size]byte, key, input []byte) {
@@ -51,7 +50,6 @@ func KDF2(t0, t1 *[blake2s.Size]byte, key, input []byte) {
 	HMAC1(t0, prk[:], []byte{0x1})
 	HMAC2(t1, prk[:], t0[:], []byte{0x2})
 	setZero(prk[:])
-	return
 }
 
 func KDF3(t0, t1, t2 *[blake2s.Size]byte, key, input []byte) {
@@ -61,7 +59,6 @@ func KDF3(t0, t1, t2 *[blake2s.Size]byte, key, input []byte) {
 	HMAC2(t1, prk[:], t0[:], []byte{0x2})
 	HMAC2(t2, prk[:], t1[:], []byte{0x3})
 	setZero(prk[:])
-	return
 }
 
 func isZero(val []byte) bool {