diff --git a/src/ui/MainWindow.py b/src/ui/MainWindow.py
index 2533257..d398772 100644
--- a/src/ui/MainWindow.py
+++ b/src/ui/MainWindow.py
@@ -1447,7 +1447,13 @@ class MainWindow(QMainWindow):
 
         # Icon-Label
         icon_label = QLabel()
-        icon_label.setPixmap(QIcon.fromTheme("document-preview").pixmap(16, 16))
+        # Icon für Diff-View mit Fallbacks
+        icon = QIcon.fromTheme("view-split-left-right")
+        if icon.isNull():
+            icon = QIcon.fromTheme("vcs-diff")
+        if icon.isNull():
+            icon = QIcon.fromTheme("system-search")  # Letzter Fallback
+        icon_label.setPixmap(icon.pixmap(16, 16))
         icon_label.setCursor(QCursor(Qt.CursorShape.PointingHandCursor))
         icon_label.setToolTip("Diff-PDF in Viewer laden")