diff --git a/artiq/gateware/rtio/analyzer.py b/artiq/gateware/rtio/analyzer.py
index f34be001a..b1e0f6b57 100644
--- a/artiq/gateware/rtio/analyzer.py
+++ b/artiq/gateware/rtio/analyzer.py
@@ -19,10 +19,10 @@ input_output_layout = [
 exception_layout = [
     ("message_type", 2),
     ("channel", 30),
-    ("padding", 64),
+    ("padding0", 64),
     ("rtio_counter", 64),
     ("exception_type", 8),
-    ("padding", 88)
+    ("padding1", 88)
 ]
 
 assert layout_len(input_output_layout) == 256