diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -1439,7 +1439,9 @@
                                           g_get_dynamic_class_info2_name);
     return m_objc_copyRealizedClassList_helper.utility_function.get();
   }
-  };
+  default:
+    llvm_unreachable("Unexpected helper");
+  }
 }
 
 lldb::addr_t &
@@ -1449,6 +1451,8 @@
     return m_gdb_objc_realized_classes_helper.args;
   case objc_copyRealizedClassList:
     return m_objc_copyRealizedClassList_helper.args;
+  default:
+    llvm_unreachable("Unexpected helper");
   }
 }