diff --git a/artiq/coredevice/mirny.py b/artiq/coredevice/mirny.py
index 95247e6d2..44f08f1dc 100644
--- a/artiq/coredevice/mirny.py
+++ b/artiq/coredevice/mirny.py
@@ -193,7 +193,6 @@ class Almazny:
     :param host_mirny - Mirny device Almazny is connected to
     """
 
-    core: KernelInvariant[Core]
     mirny_cpld: KernelInvariant[Mirny]
     att_mu: Kernel[list[int32]]
     channel_sw: Kernel[list[int32]]
diff --git a/artiq/frontend/artiq_sinara_tester.py b/artiq/frontend/artiq_sinara_tester.py
index dd16a5934..209b52e0d 100755
--- a/artiq/frontend/artiq_sinara_tester.py
+++ b/artiq/frontend/artiq_sinara_tester.py
@@ -423,7 +423,7 @@ class SinaraTester(EnvExperiment):
             input()
             print("RF ON, all attenuators OFF. Press ENTER when done.")
             for i in range(4):
-                self.almazny_set_attenuators(almazny, i, 0)
+                self.almazny_set_attenuators(almazny, i, 0.)
             input()
             print("SR outputs are OFF. Press ENTER when done.")
             self.almazny_toggle_output(almazny, False)