diff --git a/src/components/MappingBrowserTable.vue b/src/components/MappingBrowserTable.vue
index 5e850ebd..f89f22ad 100644
--- a/src/components/MappingBrowserTable.vue
+++ b/src/components/MappingBrowserTable.vue
@@ -235,7 +235,7 @@
           v-if="showEditingTools && !$jskos.compareFast(data.item.registry, $store.getters.getCurrentRegistry)"
           class="mappingBrowser-toolbar-button">
           <font-awesome-icon
-            v-if="$jskos.mappingRegistryIsStored(data.item.registry) && canCreateMapping({ registry: currentRegistry, mapping: Object.assign(data.item.mapping, { partOf: null }), user })"
+            v-if="$jskos.mappingRegistryIsStored(data.item.registry) && canCreateMapping({ registry: currentRegistry, mapping: Object.assign({}, data.item.mapping, { partOf: null }), user })"
             v-b-tooltip.hover="{ title: $t('mappingBrowser.saveAsMapping', [$jskos.prefLabel(currentRegistry)]), delay: defaults.delay.medium }"
             class="button"
             icon="save"