diff --git a/src/ert/config/field.py b/src/ert/config/field.py
index 8aa12f3ace8..ec7558eeb85 100644
--- a/src/ert/config/field.py
+++ b/src/ert/config/field.py
@@ -70,7 +70,7 @@ def adjust_graph_for_masking(G: nx.Graph, mask_indices: npt.NDArray[np.int_]):
     Returns:
     - The adjusted graph
     """
-    for removed_count, i in enumerate(mask_indices):
+    for removed_count, i in enumerate(np.sort(mask_indices)):
         # Adjust i for the number of removals to get the current index in the graph
         current_index = i - removed_count
         neighbors = list(G.neighbors(current_index))