diff --git a/src/torchio/transforms/augmentation/intensity/random_spike.py b/src/torchio/transforms/augmentation/intensity/random_spike.py
index ccf6c382..17e63457 100644
--- a/src/torchio/transforms/augmentation/intensity/random_spike.py
+++ b/src/torchio/transforms/augmentation/intensity/random_spike.py
@@ -153,8 +153,7 @@ def add_artifact(
         for index in indices:
             diff = index - mid_shape
             i, j, k = mid_shape + diff
-            # As of torch 1.7, "max is not yet implemented for complex tensors"
-            artifact = spectrum.cpu().numpy().max() * intensity_factor
+            artifact = spectrum.cpu().abs().max() * intensity_factor
             if self.invert_transform:
                 spectrum[i, j, k] -= artifact
             else: