diff --git a/compiler/src/dotty/tools/dotc/ast/untpd.scala b/compiler/src/dotty/tools/dotc/ast/untpd.scala
index 8cdc6f710ac9..817ff5c6c9fa 100644
--- a/compiler/src/dotty/tools/dotc/ast/untpd.scala
+++ b/compiler/src/dotty/tools/dotc/ast/untpd.scala
@@ -42,7 +42,7 @@ object untpd extends Trees.Instance[Untyped] with UntypedTreeInfo {
   /** mods object name impl */
   case class ModuleDef(name: TermName, impl: Template)(implicit @constructorOnly src: SourceFile)
     extends MemberDef {
-    type ThisTree[+T <: Untyped] <: Trees.NameTree[T] with Trees.MemberDef[T] with ModuleDef
+    type ThisTree[+T <: Untyped] <: Trees.NameTree[T] & Trees.MemberDef[T] & ModuleDef
     def withName(name: Name)(using Context): ModuleDef = cpy.ModuleDef(this)(name.toTermName, impl)
   }
 
diff --git a/compiler/src/dotty/tools/dotc/config/CliCommand.scala b/compiler/src/dotty/tools/dotc/config/CliCommand.scala
index b76af885765c..5c24dd57eeba 100644
--- a/compiler/src/dotty/tools/dotc/config/CliCommand.scala
+++ b/compiler/src/dotty/tools/dotc/config/CliCommand.scala
@@ -12,7 +12,7 @@ import scala.PartialFunction.cond
 
 trait CliCommand:
 
-  type ConcreteSettings <: CommonScalaSettings with Settings.SettingGroup
+  type ConcreteSettings <: CommonScalaSettings & Settings.SettingGroup
 
   def versionMsg: String