diff --git a/src/main/kotlin/com/marvinelsen/willow/ui/controllers/dialogs/PreferencesDialogController.kt b/src/main/kotlin/com/marvinelsen/willow/ui/controllers/dialogs/PreferencesDialogController.kt
index 08f70df..6ec1edc 100644
--- a/src/main/kotlin/com/marvinelsen/willow/ui/controllers/dialogs/PreferencesDialogController.kt
+++ b/src/main/kotlin/com/marvinelsen/willow/ui/controllers/dialogs/PreferencesDialogController.kt
@@ -49,13 +49,6 @@ class PreferencesDialogController(private val config: Config) {
     @FXML
     private lateinit var spinnerDefinitionFontSizeSearchResults: Spinner<Int>
 
-    private val entryHeadwordFontSizeObjectProperty = config.details.headwordFontSize.asObject()
-    private val entryPronunciationFontSizeObjectProperty = config.details.pronunciationFontSize.asObject()
-
-    private val searchResultHeadwordFontSizeObjectProperty = config.searchResults.headwordFontSize.asObject()
-    private val searchResultPronunciationFontSizeObjectProperty = config.searchResults.pronunciationFontSize.asObject()
-    private val searchResultDefinitionFontSizeObjectProperty = config.searchResults.definitionFontSize.asObject()
-
     @FXML
     private fun initialize() {
         comboBoxLocale.items.addAll(
@@ -82,27 +75,42 @@ class PreferencesDialogController(private val config: Config) {
 
         with(spinnerHeadwordFontSizeDetails) {
             editor.textFormatter = FontSizeTextFormatter()
-            valueFactory.valueProperty().bindBidirectional(entryHeadwordFontSizeObjectProperty)
+            valueFactory.value = config.details.headwordFontSize.value
+            valueProperty().addListener { _, _, newValue ->
+                config.details.headwordFontSize.value = newValue
+            }
         }
 
         with(spinnerPronunciationFontSizeDetails) {
             editor.textFormatter = FontSizeTextFormatter()
-            valueFactory.valueProperty().bindBidirectional(entryPronunciationFontSizeObjectProperty)
+            valueFactory.value = config.details.pronunciationFontSize.value
+            valueProperty().addListener { _, _, newValue ->
+                config.details.pronunciationFontSize.value = newValue
+            }
         }
 
         with(spinnerHeadwordFontSizeSearchResults) {
             editor.textFormatter = FontSizeTextFormatter()
-            valueFactory.valueProperty().bindBidirectional(searchResultHeadwordFontSizeObjectProperty)
+            valueFactory.value = config.searchResults.headwordFontSize.value
+            valueProperty().addListener { _, _, newValue ->
+                config.searchResults.headwordFontSize.value = newValue
+            }
         }
 
         with(spinnerPronunciationFontSizeSearchResults) {
             editor.textFormatter = FontSizeTextFormatter()
-            valueFactory.valueProperty().bindBidirectional(searchResultPronunciationFontSizeObjectProperty)
+            valueFactory.value = config.searchResults.pronunciationFontSize.value
+            valueProperty().addListener { _, _, newValue ->
+                config.searchResults.pronunciationFontSize.value = newValue
+            }
         }
 
         with(spinnerDefinitionFontSizeSearchResults) {
             editor.textFormatter = FontSizeTextFormatter()
-            valueFactory.valueProperty().bindBidirectional(searchResultDefinitionFontSizeObjectProperty)
+            valueFactory.value = config.searchResults.definitionFontSize.value
+            valueProperty().addListener { _, _, newValue ->
+                config.searchResults.definitionFontSize.value = newValue
+            }
         }
     }
 }