1 files changed, 5 insertions, 2 deletions
diff --git a/jstests/aggregation/sources/setWindowFields/explain.js b/jstests/aggregation/sources/setWindowFields/explain.js
index cae112cb9e5..a070aae7b0e 100644
--- a/jstests/aggregation/sources/setWindowFields/explain.js
+++ b/jstests/aggregation/sources/setWindowFields/explain.js
@@ -16,8 +16,9 @@ coll.drop();
 const bigStr = Array(1025).toString();  // 1KB of ','
 const nDocs = 1000;
 const nPartitions = 50;
-// Size was found through logging in 'SpillableCache' class.
-const docSize = 1292;
+// Initial docSize is 1292, after fields are loaded into Document's cache they are 2332.
+// Not const because post-cache doc size changes based on the number of fields accessed.
+let docSize = 2332;
 
 let bulk = coll.initializeUnorderedBulkOp();
 for (let i = 1; i <= nDocs; i++) {
@@ -137,6 +138,8 @@ function checkExplainResult(pipeline, expectedFunctionMemUsages, expectedTotalMe
     // The partition iterator will only hold five documents at once. After they are added to the
     // removable document executor they will be released.
     const numDocsHeld = 5;
+    // This test accesses fewer fields, reduce docSize accordingly.
+    docSize = 1292;
     let pipeline = [
         {
             $setWindowFields: {