diff --git a/scripts/_common.sh b/scripts/_common.sh
index 86183a1..47562a9 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -10,8 +10,6 @@ synapse_version="0.22.0"
 install_dependances() {
 	ynh_install_app_dependencies coturn build-essential python2.7-dev libffi-dev python-pip python-setuptools sqlite3 libssl-dev python-virtualenv libjpeg-dev libpq-dev postgresql
 	pip install --upgrade pip
-	pip install --upgrade cffi
-	pip install --upgrade ndg-httpsclient
 	pip install --upgrade virtualenv
 }
 
@@ -28,6 +26,8 @@ install_from_source() {
     cp ../conf/virtualenv_activate $final_path/bin/activate
     source $final_path/bin/activate
     pip install --upgrade pip
+    pip install --upgrade cffi
+    pip install --upgrade ndg-httpsclient
     pip install --upgrade setuptools
     pip install https://github.com/matrix-org/synapse/tarball/master
     pip install psycopg2