diff --git a/compiler/src/dotty/tools/dotc/ast/Desugar.scala b/compiler/src/dotty/tools/dotc/ast/Desugar.scala
index 30dad2f44847..a9999c58f81e 100644
--- a/compiler/src/dotty/tools/dotc/ast/Desugar.scala
+++ b/compiler/src/dotty/tools/dotc/ast/Desugar.scala
@@ -50,7 +50,7 @@ object desugar {
    */
   class DerivedFromParamTree(suffix: String) extends DerivedTypeTree {
 
-    /** Make sure that for all enclosing module classes their companion lasses
+    /** Make sure that for all enclosing module classes their companion classes
      *  are completed. Reason: We need the constructor of such companion classes to
      *  be completed so that OriginalSymbol attachments are pushed to DerivedTypeTrees
      *  in apply/unapply methods.