diff --git a/artiq/gateware/rtio/phy/fastino.py b/artiq/gateware/rtio/phy/fastino.py
index 9fcc71390..5e94fa4f1 100644
--- a/artiq/gateware/rtio/phy/fastino.py
+++ b/artiq/gateware/rtio/phy/fastino.py
@@ -27,6 +27,7 @@ class Fastino(Module):
 
         # dac data words
         dacs = [Signal(16) for i in range(32)]
+        self.probes = dacs
 
         header = Record([
             ("cfg", 4),