Index: tools/lldb-vscode/JSONUtils.cpp
===================================================================
--- tools/lldb-vscode/JSONUtils.cpp
+++ tools/lldb-vscode/JSONUtils.cpp
@@ -289,7 +289,7 @@
 
   object.try_emplace("verified", true);
   const auto bp_id = bp_loc.GetBreakpoint().GetID();
-  const auto vs_id = (int64_t)(((int64_t)bp_id << 32) | bp_loc.GetID());
+  const auto vs_id = (int64_t)((bp_id << 22) | bp_loc.GetID());
   object.try_emplace("id", vs_id);
   auto bp_addr = bp_loc.GetAddress();
   if (bp_addr.IsValid()) {
Index: tools/lldb-vscode/LLDBUtils.cpp
===================================================================
--- tools/lldb-vscode/LLDBUtils.cpp
+++ tools/lldb-vscode/LLDBUtils.cpp
@@ -66,8 +66,8 @@
 }
 
 int64_t MakeVSCodeFrameID(lldb::SBFrame &frame) {
-  return (int64_t)frame.GetThread().GetIndexID() << 32 |
-         (int64_t)frame.GetFrameID();
+  return (int32_t)frame.GetThread().GetIndexID() << 19 |
+         (int32_t)frame.GetFrameID();
 }
 
 } // namespace lldb_vscode
Index: tools/lldb-vscode/VSCode.cpp
===================================================================
--- tools/lldb-vscode/VSCode.cpp
+++ tools/lldb-vscode/VSCode.cpp
@@ -308,9 +308,9 @@
   const uint64_t frame_id = GetUnsigned(arguments, "frameId", UINT64_MAX);
   lldb::SBProcess process = target.GetProcess();
   // Upper 32 bits is the thread index ID
-  lldb::SBThread thread = process.GetThreadByIndexID(frame_id >> 32);
+  lldb::SBThread thread = process.GetThreadByIndexID(frame_id >> 19);
   // Lower 32 bits is the frame index
-  return thread.GetFrameAtIndex(frame_id & 0xffffffffu);
+  return thread.GetFrameAtIndex(frame_id & 0x7ffffu);
 }
 
 llvm::json::Value VSCode::CreateTopLevelScopes() {