diff --git a/core/src/main/scala/org/bitcoins/core/gcs/SipHashKey.scala b/core/src/main/scala/org/bitcoins/core/gcs/SipHashKey.scala
index c4fcfb02e6..7390216e6d 100644
--- a/core/src/main/scala/org/bitcoins/core/gcs/SipHashKey.scala
+++ b/core/src/main/scala/org/bitcoins/core/gcs/SipHashKey.scala
@@ -4,7 +4,7 @@ case class SipHashKey(bytes: ByteVector) {
     bytes.size == 16,
     "Can only use a key length of 16 bytes, got: " + bytes.size)
 
-  def toArray: Array[bytes] {
+  def toArray: Array[Byte] = {
     bytes.toArray
   }