diff --git a/src/c3nav/mapdata/render/engines/opengl.py b/src/c3nav/mapdata/render/engines/opengl.py
index 23e29e60..1803d4a9 100644
--- a/src/c3nav/mapdata/render/engines/opengl.py
+++ b/src/c3nav/mapdata/render/engines/opengl.py
@@ -141,7 +141,7 @@ class OpenGLWorker(threading.Thread):
         Render image and return it as PNG bytes
         """
         task = RenderTask(width, height, scale, offset, background_rgb, vertices)
-        self._queue.put(task)
+        self._queue.put(task, timeout=3)
         return task.get_result()