diff --git a/src/hmf/density_field/filters.py b/src/hmf/density_field/filters.py
index 394d11f..58e95e8 100644
--- a/src/hmf/density_field/filters.py
+++ b/src/hmf/density_field/filters.py
@@ -185,7 +185,7 @@ def dlnss_dlnr(self, r):
         Returns
         -------
         dlnss_dlnr : array_like
-            The derivative of the the mass variance with radius.
+            The derivative of the mass variance with radius.
 
         Notes
         -----