diff --git a/examples/device_exam.cpp b/examples/device_exam.cpp
index 0aa3d10..ac4e169 100644
--- a/examples/device_exam.cpp
+++ b/examples/device_exam.cpp
@@ -40,9 +40,10 @@ int main()
             return {};
         },
         [&s](adc_result_t<std::string> const&) -> adc_result_t<const char*> { return s.c_str(); },
-        [&s](adc_result_t<const char*> const& p) -> adc_result_t<std::string> {
-            s = p.value();
-            return s;
+        [&s](adc_result_t<const char*> const& p) mutable -> adc_result_t<std::string> {
+            // s = p.value();
+            // return s;
+            return std::string(p.value());
         });
 
     std::print("get '{}'-attr value as native int:\t", id1);