diff --git a/ddtrace/_trace/processor/__init__.py b/ddtrace/_trace/processor/__init__.py
index f8e2dbe749d..3657ee79c39 100644
--- a/ddtrace/_trace/processor/__init__.py
+++ b/ddtrace/_trace/processor/__init__.py
@@ -136,7 +136,9 @@ def process_trace(self, trace: List[Span]) -> Optional[List[Span]]:
             root_ctx = chunk_root._context
 
             if self.apm_opt_out:
-                chunk_root.set_metric(MK_APM_ENABLED, 0)
+                for span in trace:
+                    if span._local_root_value is None:
+                        span.set_metric(MK_APM_ENABLED, 0)
 
             # only trace sample if we haven't already sampled
             if root_ctx and root_ctx.sampling_priority is None:
diff --git a/releasenotes/notes/fix_asm_standalone_span_tag-60b38c1d9d2efbaa.yaml b/releasenotes/notes/fix_asm_standalone_span_tag-60b38c1d9d2efbaa.yaml
new file mode 100644
index 00000000000..f92914f931e
--- /dev/null
+++ b/releasenotes/notes/fix_asm_standalone_span_tag-60b38c1d9d2efbaa.yaml
@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    ASM: This fix resolves an issue where some root span where not appropriately tagged for ASM standalone.