diff --git a/neurokit2/ecg/ecg_findpeaks.py b/neurokit2/ecg/ecg_findpeaks.py
index 11287f76ef..6a1f34e61b 100644
--- a/neurokit2/ecg/ecg_findpeaks.py
+++ b/neurokit2/ecg/ecg_findpeaks.py
@@ -346,11 +346,6 @@ def _ecg_findpeaks_hamilton(signal, sampling_rate=1000, **kwargs):
     - Hamilton, Open Source ECG Analysis Software Documentation, E.P.Limited, 2002.
 
     """
-    import numpy as np
-    import scipy.signal
-    from collections import deque
-    from bisect import insort
-
     diff = np.abs(np.diff(signal))
 
     b = np.ones(int(0.08 * sampling_rate))