diff --git a/src/scm/plams/interfaces/adfsuite/crs.py b/src/scm/plams/interfaces/adfsuite/crs.py
index e9c6e33b..f0b96b92 100644
--- a/src/scm/plams/interfaces/adfsuite/crs.py
+++ b/src/scm/plams/interfaces/adfsuite/crs.py
@@ -850,6 +850,6 @@ def cos_to_coskf(filename: str) -> str:
                 "the 'AMSBIN' environment variable has not been set"
             )
 
-        args = [os.path.join(amsbin, "cosmo2kf"), filename, filename_out]
-        subprocess.run(args)
+        args = ["sh", os.path.join(amsbin, "cosmo2kf"), filename, filename_out]
+        subprocess.run(args, check=True, stdin=subprocess.DEVNULL)
         return filename_out