diff --git a/artiq/coredevice/sawg.py b/artiq/coredevice/sawg.py
index b508b6fcd..91062e6a6 100644
--- a/artiq/coredevice/sawg.py
+++ b/artiq/coredevice/sawg.py
@@ -36,23 +36,18 @@ class Spline:
         """
         rtio_output(now_mu(), self.channel, 0, value)
 
-    @kernel
+    @kernel(flags={"fast-math"})
     def set(self, value: TFloat):
         """Set spline value.
 
         :param value: Spline value relative to full-scale.
         """
-        rtio_output(now_mu(), self.channel, 0, self.to_mu(value))
-
-    @kernel(flags={"fast-math"})
-    def set64(self, value: TFloat):
-        """Set spline value.
-
-        :param value: Spline value relative to full-scale.
-        """
-        l = [int32(0)] * 2
-        self.pack_coeff_mu([self.to_mu64(value)], l)
-        rtio_output_wide(now_mu(), self.channel, 0, l)
+        if self.width > 32:
+            l = [int32(0)] * 2
+            self.pack_coeff_mu([self.to_mu64(value)], l)
+            rtio_output_wide(now_mu(), self.channel, 0, l)
+        else:
+            rtio_output(now_mu(), self.channel, 0, self.to_mu(value))
 
     @kernel
     def set_coeff_mu(self, value):  # TList(TInt32)
diff --git a/artiq/test/gateware/test_sawg_fe.py b/artiq/test/gateware/test_sawg_fe.py
index 7fd74a958..c7272f267 100644
--- a/artiq/test/gateware/test_sawg_fe.py
+++ b/artiq/test/gateware/test_sawg_fe.py
@@ -55,8 +55,8 @@ class SAWGTest(unittest.TestCase):
         d = self.driver
         d.offset.set(.9)
         delay(2*self.t)
-        d.frequency0.set64(.1)
-        d.frequency1.set64(.1)
+        d.frequency0.set(.1)
+        d.frequency1.set(.1)
         delay(2*self.t)
         d.offset.set(0)
         v = int(round((1 << 48) * .1 * self.t))
@@ -64,10 +64,9 @@ class SAWGTest(unittest.TestCase):
             self.rtio_manager.outputs, [
                 (0., 1, 0, int(round(
                     (1 << self.driver.offset.width - 1)*.9))),
-                (2.*self.t, 8, 0, [int(round(
+                (2.*self.t, 8, 0, int(round(
                     (1 << self.driver.frequency0.width) *
-                    self.t/self.channel.parallelism*.1)),
-                            0]),
+                    self.t/self.channel.parallelism*.1))),
                 (2.*self.t, 3, 0, [int32(v), int32(v >> 32)]),
                 (4.*self.t, 1, 0, 0),
             ])
@@ -200,9 +199,9 @@ class SAWGTest(unittest.TestCase):
 
         self.sawg0.frequency0.set(10*MHz)
         self.sawg0.phase0.set(0.)
-        self.sawg0.frequency1.set64(1*MHz)
+        self.sawg0.frequency1.set(1*MHz)
         self.sawg0.phase1.set(0.)
-        self.sawg0.frequency2.set64(13*MHz)
+        self.sawg0.frequency2.set(13*MHz)
         self.sawg0.phase2.set(0.)
         t = now_mu()
         self.sawg0.amplitude1.smooth(.0, a1, t_up, order)