diff --git a/artiq/coredevice/phaser.py b/artiq/coredevice/phaser.py
index 5f3c4c334..a68b5eda8 100644
--- a/artiq/coredevice/phaser.py
+++ b/artiq/coredevice/phaser.py
@@ -192,6 +192,7 @@ class Phaser:
         self.sync_dly = sync_dly
 
         self.dac_mmap = DAC34H84(dac).get_mmap()
+        self.dac_mmap = [int32(x) for x in self.dac_mmap]  # NAC3TODO https://git.m-labs.hk/M-Labs/nac3/issues/14
 
         self.channel = [PhaserChannel(self, ch, trf)
                         for ch, trf in enumerate([trf0, trf1])]
@@ -810,6 +811,7 @@ class PhaserChannel:
         self.phaser = phaser
         self.index = index
         self.trf_mmap = TRF372017(trf).get_mmap()
+        self.trf_mmap = [int32(x) for x in self.trf_mmap]  # NAC3TODO https://git.m-labs.hk/M-Labs/nac3/issues/14
 
         self.oscillator = [PhaserOscillator(self, osc) for osc in range(5)]
 
diff --git a/artiq/examples/nac3devices/nac3devices.py b/artiq/examples/nac3devices/nac3devices.py
index 396da3fd5..79b4815fb 100644
--- a/artiq/examples/nac3devices/nac3devices.py
+++ b/artiq/examples/nac3devices/nac3devices.py
@@ -26,7 +26,7 @@ class NAC3Devices(EnvExperiment):
     ttl0_counter: KernelInvariant[EdgeCounter]
     grabber0: KernelInvariant[Grabber]
     fastino0: KernelInvariant[Fastino]
-    # NAC3TODO segfault phaser0: KernelInvariant[Fastino]
+    phaser0: KernelInvariant[Phaser]
 
     def build(self):
         self.setattr_device("core")
@@ -40,7 +40,7 @@ class NAC3Devices(EnvExperiment):
         self.setattr_device("ttl0_counter")
         self.setattr_device("grabber0")
         self.setattr_device("fastino0")
-        # NAC3TODO segfault self.setattr_device("phaser0")
+        self.setattr_device("phaser0")
 
     @kernel
     def run(self):