diff --git a/source/Target/ThreadSpec.cpp b/source/Target/ThreadSpec.cpp
index ca47e72..07abf59 100644
--- a/source/Target/ThreadSpec.cpp
+++ b/source/Target/ThreadSpec.cpp
@@ -104,7 +104,7 @@
         else
         {
             if (GetTID() != LLDB_INVALID_THREAD_ID)
-                s->Printf("tid: 0x%x ", GetTID());
+                s->Printf("tid: 0x%llx ", GetTID());
                 
             if (GetIndex() != UINT32_MAX)
                 s->Printf("index: %d ", GetIndex());