diff --git a/artiq/coredevice/comm_kernel.py b/artiq/coredevice/comm_kernel.py
index c89b874f1..1e7febd0d 100644
--- a/artiq/coredevice/comm_kernel.py
+++ b/artiq/coredevice/comm_kernel.py
@@ -168,7 +168,7 @@ class CommKernelDummy:
     def run(self):
         pass
 
-    def serve(self, embedding_map, symbolizer, demangler):
+    def serve(self, embedding_map, symbolizer):
         pass
 
     def check_system_info(self):
diff --git a/artiq/frontend/artiq_run.py b/artiq/frontend/artiq_run.py
index e8c6d86e8..89578ec9b 100755
--- a/artiq/frontend/artiq_run.py
+++ b/artiq/frontend/artiq_run.py
@@ -33,7 +33,7 @@ class FileRunner(EnvExperiment):
 
         self.core.comm.load(kernel_library)
         self.core.comm.run()
-        self.core.comm.serve(None, None, None)
+        self.core.comm.serve(None, None)
 
 
 class ELFRunner(FileRunner):