diff --git a/edalize/tools/sandpipersaas.py b/edalize/tools/sandpipersaas.py
index baa18c61..9d2c1bcc 100644
--- a/edalize/tools/sandpipersaas.py
+++ b/edalize/tools/sandpipersaas.py
@@ -105,7 +105,7 @@ def setup(self, edam):
         commands.add([_gen_s], targets, deps)
         commands.add_env_var("RM", "rm -rf")
 
-        commands.add(["${RM} " + self.work_root], ["clean"], " ")
+        commands.add(["${RM} " + self.work_root], ["clean"], [])
         commands.set_default_target(output_file_path)
         self.commands = commands