diff --git a/generate.py b/generate.py
index 8ca4744..5fb621d 100755
--- a/generate.py
+++ b/generate.py
@@ -132,7 +132,7 @@ def conf2top(top):
             print("Warning: Error opening", top["file"], file=sys.stderr)
 
     if "command" in top:
-        body = subprocess.run(top["command"], shell=True, text=True, capture_output=True).stdout
+        body = subprocess.run(top["command"], shell=True, text=True, capture_output=True, check=True).stdout
 
     return Top(top["title"], sender, body, protostub)