diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
index 3b5b49394ceb..027010699bf0 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
@@ -108,8 +108,7 @@ void ClangASTSource::InstallASTContext(clang::ASTContext &ast_context,
     } while (false);
 
     do {
-      auto *modules_decl_vendor = llvm::cast<ClangModulesDeclVendor>(
-          m_target->GetClangModulesDeclVendor());
+      auto *modules_decl_vendor = m_target->GetClangModulesDeclVendor();
 
       if (!modules_decl_vendor)
         break;