diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.cpp
index a75671049f61d..38dd55bc76d36 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.cpp
@@ -604,6 +604,7 @@ ClangModulesDeclVendor::Create(Target &target) {
       "clang",
       "-fmodules",
       "-fimplicit-module-maps",
+      "-fcxx-modules",
       "-fsyntax-only",
       "-femit-all-decls",
       "-target",