diff --git a/rocket/src/main/scala/rocket.scala b/rocket/src/main/scala/rocket.scala
index a04a64e6..8b6e3e8f 100644
--- a/rocket/src/main/scala/rocket.scala
+++ b/rocket/src/main/scala/rocket.scala
@@ -520,7 +520,7 @@ class Rocket extends CoreModule
     }
 
     // ll write data
-    when (ll_wen) {
+    when (ll_wen && rf_waddr != UInt(0)) {
       printf ("x%d p%d 0x%x\n", rf_waddr, rf_waddr, rf_wdata)
     }
   }