diff --git a/artiq/examples/phaser/idle_kernel.py b/artiq/examples/phaser/idle_kernel.py
deleted file mode 100644
index 704787fb1..000000000
--- a/artiq/examples/phaser/idle_kernel.py
+++ /dev/null
@@ -1,21 +0,0 @@
-from artiq.experiment import *
-
-
-class IdleKernel(EnvExperiment):
-    def build(self):
-        self.setattr_device("core")
-        self.setattr_device("led")
-
-    @kernel
-    def run(self):
-        start_time = now_mu() + seconds_to_mu(500*ms)
-        while self.core.get_rtio_counter_mu() < start_time:
-            pass
-        self.core.reset()
-        while True:
-            self.led.pulse(250*ms)
-            delay(125*ms)
-            self.led.pulse(125*ms)
-            delay(125*ms)
-            self.led.pulse(125*ms)
-            delay(250*ms)