diff --git a/src/qibolab/instruments/zhinst/executor.py b/src/qibolab/instruments/zhinst/executor.py
index 0ca28332c8..5c005077f7 100644
--- a/src/qibolab/instruments/zhinst/executor.py
+++ b/src/qibolab/instruments/zhinst/executor.py
@@ -562,9 +562,10 @@ def get_channel_node_path(self, channel_name: str) -> str:
     def select_exp(self, exp, qubits, exp_options):
         """Build Zurich Experiment selecting the relevant sections."""
         # channels that were not split are just applied in parallel to the rest of the experiment
-        for ch in self.unsplit_channels:
-            with exp.section(uid="unsplit_channels"):
+        with exp.section(uid="unsplit_channels"):
+            for ch in self.unsplit_channels:
                 for pulse in self.sequence[ch]:
+                    exp.delay(signal=ch, time=pulse.pulse.start)
                     self.play_sweep(exp, ch, pulse)
 
         weights = {}