diff --git a/src/qililab/qprogram/quantum_machines_compiler.py b/src/qililab/qprogram/quantum_machines_compiler.py
index 359b62e0f..f55e19332 100644
--- a/src/qililab/qprogram/quantum_machines_compiler.py
+++ b/src/qililab/qprogram/quantum_machines_compiler.py
@@ -428,8 +428,8 @@ def _handle_measure(self, element: Measure):
         )
 
         warmup_pulse = element.warmup_pulse
-        if warmup_pulse != None:
-            play_warmup=Play(bus=element.bus, waveform=warmup_pulse)
+        if warmup_pulse is not None:
+            play_warmup = Play(bus=element.bus, waveform=warmup_pulse)
             self._handle_play(play_warmup)
 
         variable_I = qua.declare(qua.fixed)