diff --git a/scripts/update_oai-pmh.rb b/scripts/update_oai-pmh.rb
index e98ab25267ec95548bfc86aeb6a0932b438b4f0f..15a073818e115d86582dfe847d03342d25794065 100644
--- a/scripts/update_oai-pmh.rb
+++ b/scripts/update_oai-pmh.rb
@@ -226,6 +226,8 @@ class SeriesStatistics
     def to_s
         if @series.length == 0
             "N=0"
+        elsif @series.length == 1
+            "N=1 x=#{(mean).signif(2)}"
         else
             "N=#{count} min=#{(min).signif(2)} μ=#{(mean).signif(2)} max=#{(max).signif(2)} σ=#{(standard_deviation).signif(2)}"
         end