diff --git a/tools/helpers2.1/convert_to_helpers_2.1.py b/tools/helpers2.1/convert_to_helpers_2.1.py
index 18bada3a..4595bafd 100644
--- a/tools/helpers2.1/convert_to_helpers_2.1.py
+++ b/tools/helpers2.1/convert_to_helpers_2.1.py
@@ -288,7 +288,7 @@ def cleanup():
         open(script, "w").write(content)
 
     for pattern, replace in conf_replaces:
-        os.system(f"sed 's@{pattern}@{replace}@g' -i $(find conf/ -type f)")
+        os.system(f"sed -i='' 's@{pattern}@{replace}@g' $(find conf/ -type f)")
 
     git_cmds = [
         "git rm --quiet sources/extra_files/*/.gitignore 2>/dev/null",
@@ -317,7 +317,7 @@ def cleanup():
         os.system("git rm --quiet -f scripts/config")
 
     # Add helpers_version = '2.1' after yunohost requirement in manifest
-    os.system('sed -i \'/^yunohost =/a helpers_version = "2.1"\' manifest.toml')
+    os.system('sed -i='' \'/^yunohost =/a helpers_version = "2.1"\' manifest.toml')
 
 
 if __name__ == "__main__":