diff --git a/lldb/source/Plugins/TypeSystem/Swift/CMakeLists.txt b/lldb/source/Plugins/TypeSystem/Swift/CMakeLists.txt
index 30eab8a6e9c5a..c7829de818254 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/CMakeLists.txt
+++ b/lldb/source/Plugins/TypeSystem/Swift/CMakeLists.txt
@@ -13,3 +13,9 @@ add_lldb_library(lldbPluginTypeSystemSwift PLUGIN
   LINK_COMPONENTS
     Support
 )
+
+# Enforce synchronization between Swift compiler updates and LLDB via PR testing.
+check_cxx_compiler_flag("-Werror=switch" CXX_SUPPORTS_ERROR_SWITCH)
+if (CXX_SUPPORTS_ERROR_SWITCH)
+  target_compile_options(lldbPluginTypeSystemSwift PRIVATE -Werror=switch)
+endif()
diff --git a/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp b/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp
index 8c40aaea4c3fd..86e57baa63a47 100644
--- a/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp
+++ b/lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp
@@ -4851,6 +4851,7 @@ static SwiftASTContext::TypeOrDecl DeclToTypeOrDecl(swift::Decl *decl) {
     case swift::DeclKind::Module:
     case swift::DeclKind::Missing:
     case swift::DeclKind::MissingMember:
+    case swift::DeclKind::Using:
       break;
 
     case swift::DeclKind::InfixOperator: