diff --git a/linker/shared/src/main/scala/org/scalajs/linker/frontend/Refiner.scala b/linker/shared/src/main/scala/org/scalajs/linker/frontend/Refiner.scala
index 06d6bf4d1f..0c555f5fad 100644
--- a/linker/shared/src/main/scala/org/scalajs/linker/frontend/Refiner.scala
+++ b/linker/shared/src/main/scala/org/scalajs/linker/frontend/Refiner.scala
@@ -42,8 +42,7 @@ final class Refiner(config: CommonPhaseConfig, checkIR: Boolean) {
       symbolRequirements: SymbolRequirement, logger: Logger)(
       implicit ec: ExecutionContext): Future[LinkingUnit] = {
 
-    val linkedClassesByName = classDefs.map(c => c._1.className -> c._1).toMap
-    irLoader.update(linkedClassesByName)
+    irLoader.update(classDefs)
     infoLoader.update(logger)
 
     val analysis = logger.timeFuture("Refiner: Compute reachability") {
@@ -105,8 +104,8 @@ private object Refiner {
   private final class ClassDefIRLoader extends IRLoader {
     private var classesByName: Map[ClassName, ClassDef] = _
 
-    def update(classesByName: Map[ClassName, ClassDef]): Unit = {
-      this.classesByName = classesByName
+    def update(classDefs: Seq[(ClassDef, Version)]): Unit = {
+      this.classesByName = classDefs.map(c => c._1.className -> c._1).toMap
     }
 
     def classesWithEntryPoints(): Iterable[ClassName] = {