diff --git a/scripts/_common.sh b/scripts/_common.sh
index a2f9883..9686c57 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -11,6 +11,28 @@ pkg_dependencies="acl nim redis-server libsass-dev"
 # PERSONAL HELPERS
 #=================================================
 
+function build_nitter {
+	pushd "$final_path" || ynh_die
+		chown -R $app:$app $final_path
+		sudo -u $app env "PATH=/opt/yunohost/$app/nim-installation/bin:$(sudo -u $app sh -c 'echo $PATH')" nimble build -d:release -y
+		sudo -u $app env "PATH=/opt/yunohost/$app/nim-installation/bin:$(sudo -u $app sh -c 'echo $PATH')" nimble scss -y
+		mkdir -p $final_path/tmp
+		chown -R root:root $final_path
+	popd || ynh_die
+}
+
+function set_permissions {
+	chown -R root:$app $final_path
+	chown -R $app:$app $final_path/tmp
+	chmod -R g=u,g-w,o-rwx $final_path
+	setfacl -n -m u:www-data:--x $final_path
+	setfacl -nR -m u:www-data:r-x -m d:u:www-data:r-x $final_path/public
+}
+
+#=================================================
+# EXPERIMENTAL HELPERS
+#=================================================
+
 # Check the architecture
 #
 # example: architecture=$(ynh_detect_arch)
@@ -35,10 +57,6 @@ ynh_detect_arch(){
 	echo $architecture
 }
 
-#=================================================
-# EXPERIMENTAL HELPERS
-#=================================================
-
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================
diff --git a/scripts/install b/scripts/install
index d64a080..cfdc825 100755
--- a/scripts/install
+++ b/scripts/install
@@ -132,13 +132,8 @@ usermod -d $final_path $app 2>&1
 # COMPILE NITTER
 #=================================================
 ynh_script_progression --message="Compiling Nitter..." --weight=30
-pushd "$final_path" || ynh_die
-	chown -R $app:$app $final_path
-	sudo -u $app "PATH=/opt/yunohost/$app/nim-installation/bin:$(sudo -u $app sh -c 'echo $PATH')" $final_path/nim-installation/bin/nimble build -d:release -y
-	sudo -u $app "PATH=/opt/yunohost/$app/nim-installation/bin:$(sudo -u $app sh -c 'echo $PATH')" $final_path/nim-installation/bin/nimble scss -y
-	mkdir -p $final_path/tmp
-	chown -R root:root $final_path
-popd || ynh_die
+
+build_nitter
 
 #=================================================
 # SETUP SYSTEMD
@@ -159,11 +154,7 @@ ynh_add_config --template="nitter.conf" --destination="$final_path/nitter.conf"
 # SECURE FILES AND DIRECTORIES
 #=================================================
 # Set permissions to app files
-chown -R root:$app $final_path
-chown -R $app:$app $final_path/tmp
-chmod -R g=u,g-w,o-rwx $final_path
-setfacl -n -m user:www-data:rx $final_path
-setfacl -n -R -m user:www-data:rx -m default:user:www-data:rx $final_path/public
+set_permissions
 
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
diff --git a/scripts/restore b/scripts/restore
index bca195a..ee2bfa5 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -78,11 +78,7 @@ ynh_install_app_dependencies $pkg_dependencies
 #=================================================
 
 # Restore permissions on app files
-chown -R root:$app $final_path
-chown -R $app:$app $final_path/tmp
-chmod -R g=u,g-w,o-rwx $final_path
-setfacl -n -m user:www-data:rx $final_path
-setfacl -n -R -m user:www-data:rx -m default:user:www-data:rx $final_path/public
+set_permissions
 
 #=================================================
 # SPECIFIC RESTORATION
diff --git a/scripts/upgrade b/scripts/upgrade
index f74027d..22275db 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -106,13 +106,8 @@ usermod -d $final_path $app 2>&1
 # COMPILE NITTER
 #=================================================
 ynh_script_progression --message="Compiling Nitter..." --weight=30
-pushd "$final_path" || ynh_die
-	chown -R $app:$app $final_path
-	sudo -u $app "PATH=/opt/yunohost/$app/nim-installation/bin:$(sudo -u $app sh -c 'echo $PATH')" $final_path/nim-installation/bin/nimble build -d:release -y
-	sudo -u $app "PATH=/opt/yunohost/$app/nim-installation/bin:$(sudo -u $app sh -c 'echo $PATH')" $final_path/nim-installation/bin/nimble scss -y
-	mkdir -p $final_path/tmp
-	chown -R root:root $final_path
-popd || ynh_die
+
+build_nitter
 
 #=================================================
 # SETUP SYSTEMD
@@ -134,11 +129,7 @@ ynh_add_config --template="nitter.conf" --destination="$final_path/nitter.conf"
 #=================================================
 
 # Set permissions on app files
-chown -R root:$app $final_path
-chown -R $app:$app $final_path/tmp
-chmod -R g=u,g-w,o-rwx $final_path
-setfacl -n -m user:www-data:rx $final_path
-setfacl -n -R -m user:www-data:rx -m default:user:www-data:rx $final_path/public
+set_permissions
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
 #=================================================