diff --git a/lldb/source/Core/FormatEntity.cpp b/lldb/source/Core/FormatEntity.cpp
index f1470657b01ed..5055173b9b8a2 100644
--- a/lldb/source/Core/FormatEntity.cpp
+++ b/lldb/source/Core/FormatEntity.cpp
@@ -1968,7 +1968,7 @@ bool FormatEntity::Format(const Entry &entry, Stream &s,
     if (Target *target = Target::GetTargetFromContexts(exe_ctx, sc)) {
       if (auto progress = target->GetDebugger().GetCurrentProgressReport()) {
         if (progress->total != UINT64_MAX) {
-          s.Format("[{0}/{1}]", progress->completed, progress->total);
+          s.Format("[{0:N}/{1:N}]", progress->completed, progress->total);
           return true;
         }
       }