diff --git a/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala b/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala
index 3b5daaef7..8849f4987 100644
--- a/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala
+++ b/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala
@@ -9,6 +9,7 @@ import java.io.File
 import sbt.io.{ IO, Path }
 import sbt.io.syntax._
 import Path._
+import sbt.io.Milli.getModifiedTime
 
 class FileCommands(baseDirectory: File) extends BasicStatementHandler {
   lazy val commands = commandMap
@@ -67,7 +68,8 @@ class FileCommands(baseDirectory: File) extends BasicStatementHandler {
   def newer(a: String, b: String): Unit = {
     val pathA = fromString(a)
     val pathB = fromString(b)
-    val isNewer = pathA.exists && (!pathB.exists || pathA.lastModified > pathB.lastModified)
+    val isNewer = pathA.exists && (!pathB.exists || getModifiedTime(pathA) > getModifiedTime(
+      pathB))
     if (!isNewer) {
       scriptError(s"$pathA is not newer than $pathB")
     }
diff --git a/util-cache/src/main/scala/sbt/util/FileInfo.scala b/util-cache/src/main/scala/sbt/util/FileInfo.scala
index 6fcb3d619..90a65b40b 100644
--- a/util-cache/src/main/scala/sbt/util/FileInfo.scala
+++ b/util-cache/src/main/scala/sbt/util/FileInfo.scala
@@ -8,6 +8,7 @@ import scala.util.control.NonFatal
 import sbt.io.Hash
 import sjsonnew.{ Builder, JsonFormat, Unbuilder, deserializationError }
 import CacheImplicits._
+import sbt.io.Milli.getModifiedTime
 
 sealed trait FileInfo { def file: File }
 sealed trait HashFileInfo extends FileInfo { def hash: List[Byte] }
@@ -88,7 +89,7 @@ object FileInfo {
     }
 
     implicit def apply(file: File): HashModifiedFileInfo =
-      FileHashModified(file.getAbsoluteFile, Hash(file).toList, file.lastModified)
+      FileHashModified(file.getAbsoluteFile, Hash(file).toList, getModifiedTime(file))
   }
 
   object hash extends Style {
@@ -145,7 +146,7 @@ object FileInfo {
     }
 
     implicit def apply(file: File): ModifiedFileInfo =
-      FileModified(file.getAbsoluteFile, file.lastModified)
+      FileModified(file.getAbsoluteFile, getModifiedTime(file))
   }
 
   object exists extends Style {
diff --git a/util-cache/src/test/scala/FileInfoSpec.scala b/util-cache/src/test/scala/FileInfoSpec.scala
index debd427c7..a10d4b6bc 100644
--- a/util-cache/src/test/scala/FileInfoSpec.scala
+++ b/util-cache/src/test/scala/FileInfoSpec.scala
@@ -3,10 +3,11 @@ package sbt.util
 import sjsonnew.shaded.scalajson.ast.unsafe._
 import sjsonnew._, support.scalajson.unsafe._
 import sbt.internal.util.UnitSpec
+import sbt.io.Milli.getModifiedTime
 
 class FileInfoSpec extends UnitSpec {
   val file = new java.io.File(".").getAbsoluteFile
-  val fileInfo: ModifiedFileInfo = FileModified(file, file.lastModified())
+  val fileInfo: ModifiedFileInfo = FileModified(file, getModifiedTime(file))
   val filesInfo = FilesInfo(Set(fileInfo))
 
   it should "round trip" in assertRoundTrip(filesInfo)