diff --git a/scaladoc/src/dotty/tools/scaladoc/tasty/TastyParser.scala b/scaladoc/src/dotty/tools/scaladoc/tasty/TastyParser.scala
index 4b5d4fab2a0a..8b2169ee4b36 100644
--- a/scaladoc/src/dotty/tools/scaladoc/tasty/TastyParser.scala
+++ b/scaladoc/src/dotty/tools/scaladoc/tasty/TastyParser.scala
@@ -169,7 +169,12 @@ object ScaladocTastyInspector:
         val withNewMembers = p1.withNewMembers(p2.members)
         if withNewMembers.docs.isEmpty then withNewMembers.withDocs(p2.docs) else withNewMembers
       )
-      basePck.withMembers((basePck.members ++ rest).sortBy(_.name))
+      // Deduplicate members coming from different parser instances by a stable key:
+      // (location, member fullName, kind name).
+      val combined = basePck.members ++ rest
+      val keyed = combined.groupBy(m => (m.dri.location, m.fullName, m.kind.name))
+      val uniqueMembers = keyed.values.map(g => g.find(_.docs.nonEmpty).getOrElse(g.head)).toList.sortBy(_.name)
+      basePck.withMembers(uniqueMembers)
     }.toList -> inspector.rootDoc
 
 end ScaladocTastyInspector