diff --git a/source/Commands/CommandObjectThread.cpp b/source/Commands/CommandObjectThread.cpp
index 9738758..8582912 100644
--- a/source/Commands/CommandObjectThread.cpp
+++ b/source/Commands/CommandObjectThread.cpp
@@ -173,7 +173,7 @@
     strm.IndentMore();
 
     StackFrameSP frame_sp;
-    int frame_idx = 0;
+    uint32_t frame_idx = 0;
 
     if (ascending)
     {