diff --git a/artiq/gateware/rtio/phy/phaser.py b/artiq/gateware/rtio/phy/phaser.py
index d4658e828..3c19d8956 100644
--- a/artiq/gateware/rtio/phy/phaser.py
+++ b/artiq/gateware/rtio/phy/phaser.py
@@ -111,11 +111,11 @@ class MiqroChannel(Module):
                 dt.eq(dt + 2),
             ),
             If(self.ack,
-                dt.eq(0),
+                dt[1:].eq(0),
+                stb.eq(0),
                 If(stb,
                     [r.eq(0) for r in regs],
                 ),
-                stb.eq(0),
             ),
             If(self.rtlink.o.stb,
                 Array(regs)[self.rtlink.o.address].eq(self.rtlink.o.data),