diff --git a/package_linter.py b/package_linter.py
index 269391f..116ef4a 100755
--- a/package_linter.py
+++ b/package_linter.py
@@ -846,7 +846,7 @@ class Script():
                     "https://github.com/YunoHost-Apps/Experimental_helpers/tree/master/ynh_add_extra_apt_repos )"
                 )
 
-        helpers_after_official = subprocess.check_output("head -n 30 %s | grep -A 10 '^ *source */usr/share/yunohost/helpers' | grep '^ *source' | tail -n +2" % self.path, shell=True).decode("utf-8")
+        helpers_after_official = subprocess.check_output("head -n 30 '%s' | grep -A 10 '^ *source */usr/share/yunohost/helpers' | grep '^ *source' | tail -n +2" % self.path, shell=True).decode("utf-8")
         helpers_after_official = helpers_after_official.replace("source", "").replace(" ", "").strip()
         if helpers_after_official:
             helpers_after_official = helpers_after_official.split("\n")