diff --git a/modules/extras.py b/modules/extras.py
index 2bf0d17e0..466ecc152 100644
--- a/modules/extras.py
+++ b/modules/extras.py
@@ -232,7 +232,7 @@ def run_modelmerger(id_task, primary_model_name, secondary_model_name, tertiary_
 
     filename = filename_generator() if custom_name == '' else custom_name
     filename += ".inpainting" if result_is_inpainting_model else ""
-    filename += ".instrpix2pix" if result_is_instruct_pix2pix_model else ""
+    filename += ".instruct-pix2pix" if result_is_instruct_pix2pix_model else ""
     filename += "." + checkpoint_format
 
     output_modelname = os.path.join(ckpt_dir, filename)