diff --git a/compiler/src/dotty/tools/dotc/core/Definitions.scala b/compiler/src/dotty/tools/dotc/core/Definitions.scala
index b593159a7e10..4a48eccffec9 100644
--- a/compiler/src/dotty/tools/dotc/core/Definitions.scala
+++ b/compiler/src/dotty/tools/dotc/core/Definitions.scala
@@ -1777,6 +1777,7 @@ class Definitions {
       .updated(SingletonClass, ObjectClass)
       .updated(TupleClass, ProductClass)
       .updated(NonEmptyTupleClass, ProductClass)
+      .updated(PairClass, ObjectClass)
 
   // ----- Initialization ---------------------------------------------------