diff --git a/kitty/boss.py b/kitty/boss.py
index 73244c76b..878d34e2d 100644
--- a/kitty/boss.py
+++ b/kitty/boss.py
@@ -1885,9 +1885,14 @@ def update_tab_bar_data(self, os_window_id: int) -> None:
         if tm is not None:
             tm.update_tab_bar_data()
 
-    def on_drop(self, os_window_id: int, drop: dict[str, bytes] | Exception, from_self: bool, x: int, y: int) -> None:
-        if isinstance(drop, Exception):
-            self.show_error(_('Drop failed'), str(drop))
+    def on_drop(self, os_window_id: int, drop: dict[str, bytes] | int, from_self: bool, x: int, y: int) -> None:
+        if isinstance(drop, int):
+            import errno
+            code = errno.errorcode.get(drop, str(drop))
+            msg = 'Unknown error'
+            with suppress(ValueError):
+                msg = os.strerror(drop)
+            self.show_error(_('Drop failed'), f'[{code}] {msg}')
             return
         if (tm := self.os_window_map.get(os_window_id)) is None:
             return
diff --git a/kitty/glfw.c b/kitty/glfw.c
index 8eeb6e865..0358c8bf1 100644
--- a/kitty/glfw.c
+++ b/kitty/glfw.c
@@ -1669,8 +1669,7 @@ create_os_window(PyObject UNUSED *self, PyObject *args, PyObject *kw) {
     glfwSetScrollCallback(glfw_window, scroll_callback);
     glfwSetKeyboardCallback(glfw_window, key_callback);
 
-    if (0) glfwSetDragSourceCallback(glfw_window, drag_source_callback);
-
+    glfwSetDragSourceCallback(glfw_window, drag_source_callback);
     glfwSetDropEventCallback(glfw_window, on_drop);
     monotonic_t now = monotonic();
     w->is_focused = true;