diff --git a/lldb/source/Plugins/ExpressionParser/Clang/CxxModuleHandler.cpp b/lldb/source/Plugins/ExpressionParser/Clang/CxxModuleHandler.cpp
--- a/lldb/source/Plugins/ExpressionParser/Clang/CxxModuleHandler.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/CxxModuleHandler.cpp
@@ -239,7 +239,8 @@
         LLDB_LOG_ERROR(log, type.takeError(), "Couldn't import type: {0}");
         return std::nullopt;
       }
-      imported_args.push_back(TemplateArgument(*type));
+      imported_args.push_back(
+          TemplateArgument(*type, /*isNullPtr*/ false, arg.getIsDefaulted()));
       break;
     }
     case TemplateArgument::Integral: {
@@ -250,8 +251,8 @@
         LLDB_LOG_ERROR(log, type.takeError(), "Couldn't import type: {0}");
         return std::nullopt;
       }
-      imported_args.push_back(
-          TemplateArgument(d->getASTContext(), integral, *type));
+      imported_args.push_back(TemplateArgument(d->getASTContext(), integral,
+                                               *type, arg.getIsDefaulted()));
       break;
     }
     default: