diff --git a/src/schema/rules/checks/events.yaml b/src/schema/rules/checks/events.yaml
index 458e60d408..cd8fd414bd 100644
--- a/src/schema/rules/checks/events.yaml
+++ b/src/schema/rules/checks/events.yaml
@@ -26,4 +26,4 @@ StimulusFileMissing:
     - suffix == "events"
     - columns.stim_file != null
   checks:
-    - exists(columns.stim_file, "stimuli") == length(columns.stim_file)
+    - exists(columns.stim_file, "stimuli") == length(columns.stim_file) - count(columns.stim_file, "n/a")