diff --git a/src/compiler/crystal/semantic/ast.cr b/src/compiler/crystal/semantic/ast.cr
index c60780bf15c2..ac54ca4df47a 100644
--- a/src/compiler/crystal/semantic/ast.cr
+++ b/src/compiler/crystal/semantic/ast.cr
@@ -125,6 +125,8 @@ module Crystal
       # and must be preserved when cloned
       arg.set_type @type
 
+      arg.annotations = @annotations.dup
+
       arg
     end
   end