diff --git a/default_da.json b/default_da.json
index ac37c1fbfaff7e08bca01d3d23a05e686383311a..96cf8998503562c839ccfe4fb1608c1dfe01cd72 100644
--- a/default_da.json
+++ b/default_da.json
@@ -13,7 +13,7 @@
     "obs_error_sdev_generate": 0.2,
     "obs_error_sdev_assimilate": 0.1,
     "localization_cutoff": 400,
-    "nens": 50,
+    "nens": 10,
     "FILTER": "EAKF",
     "inflation_rtps_alpha": 0.1,
     "simulate_underdispersiveness": false,