diff --git a/share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/ExtendedFunctionButton.qml b/share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/ExtendedFunctionButton.qml
index add72e68684..4b57b972310 100644
--- a/share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/ExtendedFunctionButton.qml
+++ b/share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/ExtendedFunctionButton.qml
@@ -223,7 +223,7 @@ Item {
                         }
                     }
                     onClicked: {
-                        backendValue.expression = textField.text
+                        backendValue.expression = textField.text.trim()
                         expressionDialog.visible = false
                     }
                 }