diff --git a/llvm/lib/Analysis/AliasSetTracker.cpp b/llvm/lib/Analysis/AliasSetTracker.cpp
index 2879dea..23c598d 100644
--- a/llvm/lib/Analysis/AliasSetTracker.cpp
+++ b/llvm/lib/Analysis/AliasSetTracker.cpp
@@ -603,7 +603,10 @@
     for (iterator I = begin(), E = end(); I != E; ++I) {
       if (I != begin()) OS << ", ";
       I.getPointer()->printAsOperand(OS << "(");
-      OS << ", " << I.getSize() << ")";
+      if (I.getSize() == MemoryLocation::UnknownSize)
+        OS << ", unknown)";
+      else 
+        OS << ", " << I.getSize() << ")";
     }
   }
   if (!UnknownInsts.empty()) {