diff --git a/src/main/scala/uncore/tilelink2/Fuzzer.scala b/src/main/scala/uncore/tilelink2/Fuzzer.scala
index 73b4a032..b186f232 100644
--- a/src/main/scala/uncore/tilelink2/Fuzzer.scala
+++ b/src/main/scala/uncore/tilelink2/Fuzzer.scala
@@ -37,10 +37,11 @@ object LFSR64
   def apply(increment: Bool = Bool(true)): UInt =
   { 
     val wide = 64
-    val undef = Reg(UInt(width = wide)) // random value based on simulation seed
-    val lfsr = RegInit(Mux(undef === UInt(0), UInt(1), undef))
+    val lfsr = Reg(UInt(width = wide)) // random initial value based on simulation seed
     val xor = lfsr(0) ^ lfsr(1) ^ lfsr(3) ^ lfsr(4)
-    when (increment) { lfsr := Cat(xor, lfsr(wide-1,1)) }
+    when (increment) {
+      lfsr := Mux(lfsr === UInt(0), UInt(1), Cat(xor, lfsr(wide-1,1)))
+    }
     lfsr
   }
 }