diff --git a/pylops/signalprocessing/sliding1d.py b/pylops/signalprocessing/sliding1d.py
index 9bb331bb..9ddc4842 100644
--- a/pylops/signalprocessing/sliding1d.py
+++ b/pylops/signalprocessing/sliding1d.py
@@ -189,7 +189,7 @@ def __init__(
                 self.taps = [
                     tapin,
                 ]
-                for i in range(1, nwins - 1):
+                for _ in range(1, nwins - 1):
                     self.taps.append(tap)
                 self.taps.append(tapend)
                 self.taps = np.vstack(self.taps)
diff --git a/pylops/signalprocessing/sliding2d.py b/pylops/signalprocessing/sliding2d.py
index 4a76f5e6..ad0be2f5 100644
--- a/pylops/signalprocessing/sliding2d.py
+++ b/pylops/signalprocessing/sliding2d.py
@@ -230,7 +230,7 @@ def __init__(
                 self.taps = [
                     tapin[np.newaxis, :],
                 ]
-                for i in range(1, nwins - 1):
+                for _ in range(1, nwins - 1):
                     self.taps.append(tap[np.newaxis, :])
                 self.taps.append(tapend[np.newaxis, :])
                 self.taps = np.concatenate(self.taps, axis=0)