diff --git a/src/dials/util/resolution_analysis.py b/src/dials/util/resolution_analysis.py
index 458c503f28..e5b10cff68 100644
--- a/src/dials/util/resolution_analysis.py
+++ b/src/dials/util/resolution_analysis.py
@@ -382,7 +382,7 @@ def miller_array_from_mtz(unmerged_mtz, anomalous=False, labels=None):
     .help = "Minimum value of the unmerged <I>/<sigI> in the outer resolution shell"
     .short_caption = "Outer shell unmerged <I>/<sigI>"
     .expert_level = 2
-  nbins = 100
+  nbins = 50
     .type = int
     .help = "Maximum number of resolution bins to use for estimation of resolution limit."
     .short_caption = "Number of resolution bins."