diff --git a/templates/librarylink.cpp.in b/templates/librarylink.cpp.in
index b725defce..66c1d75f2 100644
--- a/templates/librarylink.cpp.in
+++ b/templates/librarylink.cpp.in
@@ -668,7 +668,7 @@ DLLEXPORT int FS@ModelName@CalculateSpectrum(
       check_spectrum(data, link);
       put_spectrum(data.model, link);
 
-      handles[hid] = data;
+      handles[hid] = std::move(data);
    } catch (const flexiblesusy::Error&) {
       put_error_output(link);
    }