diff --git a/app/services/system_command.rb b/app/services/system_command.rb
index 04b1957..52dfdc9 100644
--- a/app/services/system_command.rb
+++ b/app/services/system_command.rb
@@ -44,7 +44,7 @@ class SystemCommand
 
     SystemCommandResult.new(
       syscmd,
-      status.exitstatus,
+      status.exitstatus || 255,
       stdout.read.strip,
       stderr.read.strip,
     )