diff --git a/{{ .ProjectSnake }}/BUILD.bazel b/{{ .ProjectSnake }}/BUILD.bazel
index 19a0731..30be9bc 100644
--- a/{{ .ProjectSnake }}/BUILD.bazel	
+++ b/{{ .ProjectSnake }}/BUILD.bazel	
@@ -53,6 +53,11 @@ js_library(
 # aspect:map_kind py_binary py_binary @aspect_rules_py//py:defs.bzl
 # aspect:map_kind py_library py_library @aspect_rules_py//py:defs.bzl
 # aspect:map_kind py_test py_test @aspect_rules_py//py:defs.bzl
+#
+# Don't walk into virtualenvs when looking for python sources.
+# We don't intend to plant BUILD files there.
+# aspect:exclude **/*.venv
+#
 # Fetches metadata for python packages we depend on.
 modules_mapping(
     name = "modules_map",