diff --git a/artiq/protocols/pc_rpc.py b/artiq/protocols/pc_rpc.py
index 512237d60..d4484dfc2 100644
--- a/artiq/protocols/pc_rpc.py
+++ b/artiq/protocols/pc_rpc.py
@@ -538,6 +538,9 @@ class Server(_AsyncioServer):
             except KeyError:
                 return
 
+            if callable(target):
+                target = target()
+
             while True:
                 line = await reader.readline()
                 if not line: