diff --git a/hardware_system.py b/hardware_system.py
index 077bf9541db8dcb8c0c869511804175f4a4df211..a3c19ad9a968add6521b8dfa0e04cde7c8e591fe 100644
--- a/hardware_system.py
+++ b/hardware_system.py
@@ -126,7 +126,7 @@ class OhmPiHardware:
                               self.rx.voltage])
             sample+=1
             sleep_time = self._start_time + datetime.timedelta(seconds = sample * sampling_rate / 1000) - lap
-            time.sleep(np.min([0, np.abs(sleep_time.total_seconds())]))
+            time.sleep(np.max([0, sleep_time.total_seconds()]))
         self.readings = np.array(_readings)
         self._pulse += 1