diff --git a/src/main/java/org/cryptomator/ui/fxapp/JfxUiAppearanceProvider.java b/src/main/java/org/cryptomator/ui/fxapp/JfxUiAppearanceProvider.java
index a7ac9163e..ca5bec7d4 100644
--- a/src/main/java/org/cryptomator/ui/fxapp/JfxUiAppearanceProvider.java
+++ b/src/main/java/org/cryptomator/ui/fxapp/JfxUiAppearanceProvider.java
@@ -63,7 +63,7 @@ public class JfxUiAppearanceProvider implements UiAppearanceProvider {
 				uiAppearanceListener.systemAppearanceChanged(newTheme);
 			};
 			LOG.debug("Register listener for OS theme changes");
-			uiAppearanceListeners.compute(uiAppearanceListener, (k, v) -> {
+			uiAppearanceListeners.computeIfAbsent(uiAppearanceListener, k -> {
 				Platform.runLater(() -> preferences.colorSchemeProperty().addListener(fxChangeListener));
 				return fxChangeListener;
 			});