diff --git a/nansat/domain.py b/nansat/domain.py
index 54485d85a..b38ff0dd6 100644
--- a/nansat/domain.py
+++ b/nansat/domain.py
@@ -554,6 +554,8 @@ def get_border(self, n_points=10, fix_lon=True, **kwargs):
         y_rc_vec = Domain._get_row_col_vector(y_size, n_points)
         col_vec, row_vec = Domain._compound_row_col_vectors(x_size, y_size, x_rc_vec, y_rc_vec)
         lon, lat = self.transform_points(col_vec, row_vec)
+        lon = lon.round(decimals=4)
+        lat = lat.round(decimals=4)
 
         crosses_dateline = np.diff(lon).max() > 100 # arbitrary number, larger than a maximum step
         if crosses_dateline and fix_lon: