diff --git a/services/experimentAnalysis.ts b/services/experimentAnalysis.ts
index cc24e2a..ed172ba 100644
--- a/services/experimentAnalysis.ts
+++ b/services/experimentAnalysis.ts
@@ -134,7 +134,7 @@ function splitPeriods(
     const weekStartTs = w.timestamp;
     const weekEndTs = w.timestamp + 6 * 86400000 + 86399999;
 
-    const overlapsAfter = weekEndTs >= startTs && weekStartTs <= endTs;
+    const overlapsAfter = weekEndTs >= startTs && weekStartTs < endTs;
     const overlapsBefore = weekEndTs >= beforeStartTs && weekStartTs < beforeEndTs;
 
     if (overlapsAfter) {