diff --git a/uncore/src/main/scala/cache.scala b/uncore/src/main/scala/cache.scala
index 4af26399..953aa2b6 100644
--- a/uncore/src/main/scala/cache.scala
+++ b/uncore/src/main/scala/cache.scala
@@ -958,6 +958,7 @@ class L2AcquireTracker(trackerId: Int, bankId: Int) extends L2XactTracker {
 
   //TODO: Assumes in-order network
   assert(!(state === s_idle && io.inner.acquire.fire() &&
+    !io.iacq().isSubBlockType() &&
     io.iacq().addr_beat != UInt(0)),
     "AcquireTracker initialized with a tail data beat.")
 }