diff --git a/geomagio/algorithm/SqDistAlgorithm.py b/geomagio/algorithm/SqDistAlgorithm.py
index 1253c471b3fbab3a110e48c5f02ad58dab8c72c7..169aad38a25ac2cf0540e4b5be79309cac0e7a03 100644
--- a/geomagio/algorithm/SqDistAlgorithm.py
+++ b/geomagio/algorithm/SqDistAlgorithm.py
@@ -329,7 +329,7 @@ class SqDistAlgorithm(Algorithm):
         if l0 is None:
             l = np.nanmean(yobs[0:int(m)])
             if l is np.nan:
-               l = 0.
+                l = 0.
         else:
             l = l0
             if not np.isscalar(l0):