diff --git a/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala b/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala
index b053b0ea777f..f7b56c246b8c 100644
--- a/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala
+++ b/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala
@@ -1399,7 +1399,7 @@ class TreeUnpickler(reader: TastyReader,
       if (path.nonEmpty) {
         val sourceFile = ctx.getSource(path)
         posUnpicklerOpt match
-          case Some(posUnpickler) =>
+          case Some(posUnpickler) if !sourceFile.initizlized =>
             sourceFile.setLineIndicesFromLineSizes(posUnpickler.lineSizes)
           case _ =>
         pickling.println(i"source change at $addr: $path")
diff --git a/compiler/src/dotty/tools/dotc/util/SourceFile.scala b/compiler/src/dotty/tools/dotc/util/SourceFile.scala
index 73fd53289a9b..c1977f99e5c9 100644
--- a/compiler/src/dotty/tools/dotc/util/SourceFile.scala
+++ b/compiler/src/dotty/tools/dotc/util/SourceFile.scala
@@ -144,6 +144,9 @@ class SourceFile(val file: AbstractFile, computeContent: => Array[Char]) extends
     if lineIndicesCache eq null then
       lineIndicesCache = calculateLineIndicesFromContents()
     lineIndicesCache
+
+  def initizlized = lineIndicesCache != null
+
   def setLineIndicesFromLineSizes(sizes: Array[Int]): Unit =
     val lines = sizes.length
     val indices = new Array[Int](lines + 1)
diff --git a/scaladoc/test-source-links/dotty/tools/scaladoc/source-links/RemoteLinksTest.scala b/scaladoc/test-source-links/dotty/tools/scaladoc/source-links/RemoteLinksTest.scala
index 1a9831ec8bad..1e8a1227235d 100644
--- a/scaladoc/test-source-links/dotty/tools/scaladoc/source-links/RemoteLinksTest.scala
+++ b/scaladoc/test-source-links/dotty/tools/scaladoc/source-links/RemoteLinksTest.scala
@@ -38,8 +38,9 @@ class RemoteLinksTest:
   def runTest =
     assertTrue(mtslAll.nonEmpty)
     val mtsl = randomGenerator.shuffle(mtslAll).take(80) // take 80 random entries
-    val pageToMtsl: Map[String, List[(String, String)]] = mtsl.groupMap(_._2.split("#L").head)(v => (v._1, v._2.split("#L").last))
-    pageToMtsl.foreach { case (link, members) =>
+    val pageToMtsl: Map[String, List[(String, Int)]] =
+      mtsl.groupMap(_._2.split("#L").head)(v => (v._1, v._2.split("#L").last.toInt))
+    pageToMtsl.toSeq.sortBy(_._1).foreach { case (link, members) =>
       try
         val doc = getDocumentFromUrl(link)
         println(s"Checking $link")
@@ -47,7 +48,7 @@ class RemoteLinksTest:
           if !member.startsWith("given_") then // TODO: handle synthetic givens, for now we disable them from testing
             val toLine = expectedLine + 3
             val memberToMatch = member.replace("`", "")
-            val lineCorrectlyDefined = (expectedLine.toInt until toLine.toInt).exists{ line =>
+            val lineCorrectlyDefined = (expectedLine until toLine).exists{ line =>
               val loc = doc.select(s"#LC$line").text
 
               loc.contains(memberToMatch)