diff --git a/tests/test_collection_export_lifecycle.py b/tests/test_collection_export_lifecycle.py
index 4bf5dbf..8084c0c 100644
--- a/tests/test_collection_export_lifecycle.py
+++ b/tests/test_collection_export_lifecycle.py
@@ -33,7 +33,11 @@ def window(tmp_path, monkeypatch):
         try:
             ui = app.App()
             break
-        except app.tk.TclError:
+        except (app.tk.TclError, RuntimeError) as exc:
+            # tkinterdnd2 wraps a failed "package require tkdnd" in a plain
+            # RuntimeError; treat that like the transient TclError it hides.
+            if isinstance(exc, RuntimeError) and "tkdnd" not in str(exc):
+                raise
             partial = getattr(app.tk, "_default_root", None)
             if partial is not None:
                 try:
diff --git a/tests/test_ui_accessibility.py b/tests/test_ui_accessibility.py
index fa7add5..1b1be8e 100644
--- a/tests/test_ui_accessibility.py
+++ b/tests/test_ui_accessibility.py
@@ -34,12 +34,16 @@ def setUp(self) -> None:
         self._second_doc = tmp_path / "Paper_Markierungen.pdf"
         self._second_doc.write_bytes(b"%PDF-1.4\n%%EOF\n")
 
-        last_error: tk.TclError | None = None
+        last_error: Exception | None = None
         for _attempt in range(3):
             try:
                 self.app = DokuReader.App()
                 break
-            except tk.TclError as exc:
+            except (tk.TclError, RuntimeError) as exc:
+                # tkinterdnd2 wraps a failed "package require tkdnd" in a
+                # plain RuntimeError; treat it like the TclError it hides.
+                if isinstance(exc, RuntimeError) and "tkdnd" not in str(exc):
+                    raise
                 last_error = exc
                 partial_root = getattr(tk, "_default_root", None)
                 if partial_root is not None: