diff --git a/src/plugins/qmldesigner/components/formeditor/formeditorwidget.cpp b/src/plugins/qmldesigner/components/formeditor/formeditorwidget.cpp
index 841ac1fce1e..46c7a5cc8f4 100644
--- a/src/plugins/qmldesigner/components/formeditor/formeditorwidget.cpp
+++ b/src/plugins/qmldesigner/components/formeditor/formeditorwidget.cpp
@@ -324,11 +324,6 @@ void FormEditorWidget::changeRootItemHeight(const QString &heighText)
     }
 }
 
-namespace {
-constexpr AuxiliaryDataKeyView formeditorColorProperty{AuxiliaryDataType::Temporary,
-                                                       "formeditorColor"};
-}
-
 void FormEditorWidget::changeBackgound(const QColor &color)
 {
     if (color.alpha() == 0) {
diff --git a/src/plugins/qmldesigner/designercore/include/auxiliarydataproperties.h b/src/plugins/qmldesigner/designercore/include/auxiliarydataproperties.h
index b6bb22290a7..55eb57f2e1b 100644
--- a/src/plugins/qmldesigner/designercore/include/auxiliarydataproperties.h
+++ b/src/plugins/qmldesigner/designercore/include/auxiliarydataproperties.h
@@ -115,6 +115,8 @@ inline constexpr AuxiliaryDataKeyView bakeLightsManualProperty{AuxiliaryDataType
                                                                "bakeLightsManual"};
 inline constexpr AuxiliaryDataKeyView contextImageProperty{AuxiliaryDataType::Temporary,
                                                            "contextImage"};
+inline constexpr AuxiliaryDataKeyView formeditorColorProperty{AuxiliaryDataType::Document,
+                                                              "formeditorColor"};
 
 // Most material preview aux properties are duplicated as document and instance types, as they
 // are both required to be persistent and used at runtime to control material preview rendering