diff --git a/modules/amv/caliop_clavrx_amv.py b/modules/amv/caliop_clavrx_amv.py
index 6a3a7c6383c8a055a92b9c4990fde230af601756..122184f1aedea34f2c6d7e6c319cc0cdce373a58 100644
--- a/modules/amv/caliop_clavrx_amv.py
+++ b/modules/amv/caliop_clavrx_amv.py
@@ -121,7 +121,7 @@ def create_file(match_dct, output_path, target_filepath, caliop_clavrx_params, a
 
     filename = os.path.split(target_filepath)[1]
     w_o_ext, ext = os.path.splitext(filename)
-    filename = w_o_ext+'.amvs'+ext
+    filename = w_o_ext+'.amvs'+'.nc'
 
     output_filepath = output_path+filename