diff --git a/lectures/02-interfaces/lecture.slide b/lectures/02-interfaces/lecture.slide
index 3fb2e2b..5dae78b 100644
--- a/lectures/02-interfaces/lecture.slide
+++ b/lectures/02-interfaces/lecture.slide
@@ -363,7 +363,7 @@ Check type
 
 * Type switch
 
-  switch x.(type)
+  switch x.(type) {
   case nil: // ...
   case int, uint: // ...
   case bool: // ...