diff --git a/common/src/test/scala/CryptoInterfaceTest.scala b/common/src/test/scala/CryptoInterfaceTest.scala
index 7b75ea05..2bca544a 100644
--- a/common/src/test/scala/CryptoInterfaceTest.scala
+++ b/common/src/test/scala/CryptoInterfaceTest.scala
@@ -109,14 +109,12 @@ class CryptoInterfaceTest extends Specification { args(stopOnFail = true)
 
     "safely handle multiple starts" in {
       val dontCare = ByteVector.fill(16)(0x42)
-      var dh = new CryptoDHState()
+      val dh = new CryptoDHState()
 
       dh.start()
       dh.start() must throwA[IllegalStateException]
       dh.close
 
-      dh = new CryptoDHState()
-
       ok
     }