diff --git a/scripts/install b/scripts/install
index 0d839e4..5086fce 100644
--- a/scripts/install
+++ b/scripts/install
@@ -33,6 +33,8 @@ ynh_script_progression --message="Setting up source files..." --weight=4
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source --dest_dir="$install_dir"
 
+chmod 750 "$install_dir"
+chmod -R o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index b3cc02b..87ef668 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -17,6 +17,8 @@ ynh_script_progression --message="Restoring the app main directory..." --weight=
 
 ynh_restore_file --origin_path="$install_dir" --not_mandatory
 
+chmod 750 "$install_dir"
+chmod -R o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index d1b4968..b2e2079 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -65,6 +65,8 @@ then
 	ynh_setup_source --dest_dir="$install_dir"
 fi
 
+chmod 750 "$install_dir"
+chmod -R o-rwx "$install_dir"
 chown -R $app:www-data "$install_dir"
 
 #=================================================