diff --git a/artiq/gateware/rtio/analyzer.py b/artiq/gateware/rtio/analyzer.py
index 0a1302191..f56989832 100644
--- a/artiq/gateware/rtio/analyzer.py
+++ b/artiq/gateware/rtio/analyzer.py
@@ -135,6 +135,7 @@ class MessageEncoder(Module, AutoCSR):
                 ).Else(
                     self.source.data.eq(input_output.raw_bits())
                 ),
+                self.source.eop.eq(0),
                 self.source.stb.eq(enable &
                                   (input_output_stb | exception_stb)),