diff --git a/util-cache/src/main/scala/sbt/internal/util/CacheEventLog.scala b/util-cache/src/main/scala/sbt/internal/util/CacheEventLog.scala
index af8df597a..16c88b39f 100644
--- a/util-cache/src/main/scala/sbt/internal/util/CacheEventLog.scala
+++ b/util-cache/src/main/scala/sbt/internal/util/CacheEventLog.scala
@@ -71,7 +71,7 @@ class CacheEventLog:
       val hits = events.view.collect { case (ActionCacheEvent.Found(id), v) => (id, v) }.toMap
       val hitCount = hits.values.sum
       val missCount = total - hitCount
-      val hitRate = (hitCount.toDouble / total.toDouble)
+      val hitRate = if total > 0 then (hitCount.toDouble / total.toDouble) else 0.0
       val onsiteCount = events.get(ActionCacheEvent.OnsiteTask)
       val errorCount = events.get(ActionCacheEvent.Error)
       CacheEventSummary.Data(