diff --git a/nodes.py b/nodes.py
index ac9360f..fca3608 100644
--- a/nodes.py
+++ b/nodes.py
@@ -49,6 +49,11 @@ class SaveImageAsSDWebUI:
     CATEGORY = "image"
 
     def save_images(self, images, seed, filename_prefix="ComfyUI", image_format="png", quality=100, prompt=None, extra_pnginfo=None):
+        # If prefix ends with a path separator (e.g. "comfy-txt2img/"),
+        # treat it as a directory and append default filename "ComfyUI".
+        if filename_prefix.endswith('/') or filename_prefix.endswith('\\'):
+            filename_prefix = filename_prefix + "ComfyUI"
+
         full_output_folder, filename, counter, subfolder, _ = folder_paths.get_save_image_path(
             filename_prefix, self.output_dir, images[0].shape[1], images[0].shape[0]
         )