diff --git a/artiq/coredevice/phaser.py b/artiq/coredevice/phaser.py
index 3f5e4262c..e696fa227 100644
--- a/artiq/coredevice/phaser.py
+++ b/artiq/coredevice/phaser.py
@@ -1072,7 +1072,9 @@ class PhaserChannel:
             data = 1
         if hold == 1:
             data = data | (1 << 1)
-        data = data | (profile << 2)
+        if bypass:
+            hold = 1
+        data = (profile << 2) | (hold << 1) | (bypass << 0)
         self.phaser.write8(addr, data)
 
     @kernel