diff --git a/core/shared/src/main/scala/org/scalacheck/Gen.scala b/core/shared/src/main/scala/org/scalacheck/Gen.scala
index a89e7ec2..29518027 100644
--- a/core/shared/src/main/scala/org/scalacheck/Gen.scala
+++ b/core/shared/src/main/scala/org/scalacheck/Gen.scala
@@ -1521,7 +1521,7 @@ object Gen extends GenArities with GenVersionSpecific {
         c.set(HOUR_OF_DAY, 23)
         c.set(MINUTE, 59)
         c.set(SECOND, 59)
-        c.set(MILLISECOND, 59)
+        c.set(MILLISECOND, 999)
       })
 
     val firstDayOfYearGen: Gen[Calendar] =