diff --git a/artiq/coredevice/fastino.py b/artiq/coredevice/fastino.py
index c5f297f74..72a6607c2 100644
--- a/artiq/coredevice/fastino.py
+++ b/artiq/coredevice/fastino.py
@@ -111,7 +111,7 @@ class Fastino:
         :param addr: Address to read from.
         :return: The data read.
         """
-        raise NotImplementedError()
+        raise NotImplementedError
         # rtio_output(self.channel | addr | 0x80)
         # return rtio_input_data(self.channel >> 8)
 
diff --git a/artiq/coredevice/grabber.py b/artiq/coredevice/grabber.py
index d57db347b..cc254cf08 100644
--- a/artiq/coredevice/grabber.py
+++ b/artiq/coredevice/grabber.py
@@ -118,12 +118,12 @@ class Grabber:
         if timestamp == int64(-1):
             raise GrabberTimeoutException("Timeout before Grabber frame available")
         if sentinel != self.sentinel:
-            raise OutOfSyncException()
+            raise OutOfSyncException
 
         for i in range(len(data)):
             timestamp, roi_output = rtio_input_timestamped_data(timeout_mu, channel)
             if roi_output == self.sentinel:
-                raise OutOfSyncException()
+                raise OutOfSyncException
             if timestamp == int64(-1):
                 raise GrabberTimeoutException(
                     "Timeout retrieving ROIs (attempting to read more ROIs than enabled?)")
diff --git a/artiq/examples/kc705_nist_clock/repository/tdr.py b/artiq/examples/kc705_nist_clock/repository/tdr.py
index fa0776371..0a7380e14 100644
--- a/artiq/examples/kc705_nist_clock/repository/tdr.py
+++ b/artiq/examples/kc705_nist_clock/repository/tdr.py
@@ -81,6 +81,6 @@ class TDR(EnvExperiment):
         for i in range(len(self.t)):
             ti = self.ttl3.timestamp_mu(now_mu())
             if ti <= int64(0):
-                raise PulseNotReceivedError()
+                raise PulseNotReceivedError
             self.t[i] = int32(int64(self.t[i]) + ti - t0)
         self.ttl3.count(now_mu())  # flush
diff --git a/artiq/frontend/artiq_sinara_tester.py b/artiq/frontend/artiq_sinara_tester.py
index 86843ecc4..f0c5d27a7 100755
--- a/artiq/frontend/artiq_sinara_tester.py
+++ b/artiq/frontend/artiq_sinara_tester.py
@@ -689,7 +689,7 @@ class SinaraTester(EnvExperiment):
                     window=0x000, profiles=[1 for _ in range(len(osc))])
                 self.core.delay(1.*ms)
         else:
-            raise ValueError()
+            raise ValueError
 
     @kernel
     def phaser_led_wave(self, phasers: list[Phaser]):
diff --git a/artiq/language/core.py b/artiq/language/core.py
index 00cbae3a3..fd1818e3d 100644
--- a/artiq/language/core.py
+++ b/artiq/language/core.py
@@ -138,7 +138,7 @@ class Option(Generic[T]):
 
     def unwrap(self):
         if self.is_none():
-            raise UnwrapNoneError()
+            raise UnwrapNoneError
         return self._nac3_option
 
     def __repr__(self) -> str:
diff --git a/artiq/test/coredevice/test_portability.py b/artiq/test/coredevice/test_portability.py
index 21f73000a..05988fcb2 100644
--- a/artiq/test/coredevice/test_portability.py
+++ b/artiq/test/coredevice/test_portability.py
@@ -140,7 +140,7 @@ class _NestedFinally(EnvExperiment):
                 raise ValueError
             finally:
                 try:
-                    raise IndexError()
+                    raise IndexError
                 except ValueError:
                     self._trace(0)
         except:
@@ -166,7 +166,7 @@ class _NestedExceptions(EnvExperiment):
                 raise
             finally:
                 try:
-                    raise IndexError()
+                    raise IndexError
                 except ValueError:
                     self._trace(1)
                     raise
@@ -212,7 +212,7 @@ class _Exceptions(EnvExperiment):
                 if i == 1:
                     raise _MyException()
                 elif i == 2:
-                    raise IndexError()
+                    raise IndexError
             except IndexError:
                 self._trace(101)
                 raise
diff --git a/artiq/test/coredevice/test_rtio.py b/artiq/test/coredevice/test_rtio.py
index 6c9969399..90024c15a 100644
--- a/artiq/test/coredevice/test_rtio.py
+++ b/artiq/test/coredevice/test_rtio.py
@@ -72,7 +72,7 @@ class RTT(EnvExperiment):
                 self.ttl_inout.pulse(1*us)
         t1 = self.ttl_inout.timestamp_mu(now_mu())
         if t1 < 0:
-            raise PulseNotReceived()
+            raise PulseNotReceived
         self.set_dataset("rtt", self.core.mu_to_seconds(t1 - t0))
 
 
@@ -96,7 +96,7 @@ class Loopback(EnvExperiment):
                 self.loop_out.pulse(1*us)
         t1 = self.loop_in.timestamp_mu(now_mu())
         if t1 < 0:
-            raise PulseNotReceived()
+            raise PulseNotReceived
         self.set_dataset("rtt", self.core.mu_to_seconds(t1 - t0))
 
 
@@ -257,7 +257,7 @@ class LoopbackGateTiming(EnvExperiment):
         in_mu = self.loop_in.timestamp_mu(gate_end_mu)
         print("timings: ", gate_start_mu, in_mu - lat_offset, gate_end_mu)
         if in_mu < 0:
-            raise PulseNotReceived()
+            raise PulseNotReceived
         if not (gate_start_mu <= (in_mu - lat_offset) <= gate_end_mu):
             raise IncorrectPulseTiming("Input event should occur during gate")
         if not (-2 < (in_mu - out_mu - loop_delay_mu) < 2):
@@ -433,7 +433,7 @@ class HandoverException(EnvExperiment):
     def k(self, var):
         self.set_dataset(var, now_mu())
         delay_mu(1234)
-        raise DummyException()
+        raise DummyException
 
     def run(self):
         try: