diff --git a/capa/ida/helpers.py b/capa/ida/helpers.py
index 93046b79..eab65ab6 100644
--- a/capa/ida/helpers.py
+++ b/capa/ida/helpers.py
@@ -132,7 +132,7 @@ def collect_metadata(rules):
 
     return {
         "timestamp": datetime.datetime.now().isoformat(),
-        # "argv" is not relevant here
+        "argv": [],
         "sample": {
             "md5": md5,
             "sha1": "",  # not easily accessible
diff --git a/capa/render/result_document.py b/capa/render/result_document.py
index 1689aec5..2b662fea 100644
--- a/capa/render/result_document.py
+++ b/capa/render/result_document.py
@@ -75,7 +75,7 @@ class Analysis(FrozenModel):
 class Metadata(FrozenModel):
     timestamp: datetime.datetime
     version: str
-    argv: Optional[Tuple[str, ...]]
+    argv: Tuple[str, ...]
     sample: Sample
     analysis: Analysis