diff --git a/phys2denoise/metrics/utils.py b/phys2denoise/metrics/utils.py
index 7426a5c..7fb7a23 100644
--- a/phys2denoise/metrics/utils.py
+++ b/phys2denoise/metrics/utils.py
@@ -1,5 +1,6 @@
 """Miscellaneous utility functions for metric calculation."""
 import logging
+import warnings
 
 import numpy as np
 
@@ -45,11 +46,23 @@ def mirrorpad_1d(arr, buffer=250):
     -------
     arr_out
     """
+        
     mirror = np.flip(arr, axis=0)
-    idx = range(arr.shape[0] - buffer, arr.shape[0])
-    pre_mirror = np.take(mirror, idx, axis=0)
-    idx = range(0, buffer)
-    post_mirror = np.take(mirror, idx, axis=0)
+    # If buffer is too long, fix it and issue a warning
+    try: 
+        idx = range(arr.shape[0] - buffer, arr.shape[0])
+        pre_mirror = np.take(mirror, idx, axis=0)
+        idx = range(0, buffer)
+        post_mirror = np.take(mirror, idx, axis=0)
+    except IndexError:
+        fixed_buffer = len(arr)
+        warnings.warn('Requested buffer size ({}) is longer than arr length ({}). Fixing buffer size to {}.'.format(
+            buffer, len(arr), fixed_buffer
+        ))
+        idx = range(arr.shape[0] - fixed_buffer, arr.shape[0])
+        pre_mirror = np.take(mirror, idx, axis=0)
+        idx = range(0, fixed_buffer)
+        post_mirror = np.take(mirror, idx, axis=0)
     arr_out = np.concatenate((pre_mirror, arr, post_mirror), axis=0)
     return arr_out