diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index bed9b9e..529325d 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -2206,9 +2206,9 @@ We might write
     bool owned;
     owner<istream*> inp;
     switch (source) {
-    case std_in:        owned = false; inp = &cin;
-    case command_line:  owned = true;  inp = new istringstream{argv[2]};
-    case file:          owned = true;  inp = new ifstream{argv[2]};
+    case std_in:        owned = false; inp = &cin;                       break;
+    case command_line:  owned = true;  inp = new istringstream{argv[2]}; break;
+    case file:          owned = true;  inp = new ifstream{argv[2]};      break;
     }
     istream& in = *inp;