diff --git a/singlecell/src/org/labkey/singlecell/pipeline/singlecell/AppendNimble.java b/singlecell/src/org/labkey/singlecell/pipeline/singlecell/AppendNimble.java
index 67b24280a..1da9a91b1 100644
--- a/singlecell/src/org/labkey/singlecell/pipeline/singlecell/AppendNimble.java
+++ b/singlecell/src/org/labkey/singlecell/pipeline/singlecell/AppendNimble.java
@@ -77,7 +77,7 @@ protected Chunk createParamChunk(SequenceOutputHandler.JobContext ctx, List<Seur
         for (int i = 0; i < json.length(); i++)
         {
             JSONArray arr = json.getJSONArray(i);
-            if (arr.length() != 3)
+            if (arr.length() != 4)
             {
                 throw new PipelineJobException("Unexpected value: " + json.getString(i));
             }