diff --git a/src/gateware/zc706.py b/src/gateware/zc706.py
index b07977b..a03ef77 100755
--- a/src/gateware/zc706.py
+++ b/src/gateware/zc706.py
@@ -492,7 +492,7 @@ class _NIST_CLOCK_RTIO:
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=512))
 
-        phy = ttl_simple.Output(platform.request("user_led_33", 2))
+        phy = ttl_simple.Output(platform.request("user_led_33", 0))
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy))
 
@@ -555,7 +555,7 @@ class _NIST_QC2_RTIO:
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=512))
 
-        phy = ttl_simple.Output(platform.request("user_led_33", 2))
+        phy = ttl_simple.Output(platform.request("user_led_33", 0))
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy))