diff --git a/ddtrace/internal/datadog/profiling/dd_wrapper/src/uploader_builder.cpp b/ddtrace/internal/datadog/profiling/dd_wrapper/src/uploader_builder.cpp
index 3047688475a..5408d2d6b00 100644
--- a/ddtrace/internal/datadog/profiling/dd_wrapper/src/uploader_builder.cpp
+++ b/ddtrace/internal/datadog/profiling/dd_wrapper/src/uploader_builder.cpp
@@ -116,6 +116,7 @@ Datadog::UploaderBuilder::build()
         { ExportTagKey::version, version },
         { ExportTagKey::language, language },
         { ExportTagKey::runtime, runtime },
+        { ExportTagKey::runtime_id, runtime_id },
         { ExportTagKey::runtime_version, runtime_version },
         { ExportTagKey::profiler_version, profiler_version },
     };
diff --git a/releasenotes/notes/profiling-stack-v2-runtime-7a4700f8571deddc.yaml b/releasenotes/notes/profiling-stack-v2-runtime-7a4700f8571deddc.yaml
new file mode 100644
index 00000000000..a0cd1b7b54e
--- /dev/null
+++ b/releasenotes/notes/profiling-stack-v2-runtime-7a4700f8571deddc.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    profiling: propagates ``runtime_id`` tag to libdatadog exporter. It is
+    a unique string identifier for the profiled process. For example, Thread
+    Timeline visualization uses it to distinguish different processes.