diff --git a/scripts/_common.sh b/scripts/_common.sh
index 07ee630..963edc0 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -42,21 +42,11 @@ install_sources() {
         test -e $code_dir/bin/python3 || python3 -m venv $code_dir
 
         # Install synapse in virtualenv
+        local pip3=$code_dir/bin/pip3
 
-        # We set all necessary environement variable to create a python virtualenvironnement.
-        u_arg='u'
-        set +$u_arg;
-        source $code_dir/bin/activate
-        set -$u_arg;
-
-        pip3 install --upgrade setuptools wheel pip
-        pip3 install --upgrade cffi ndg-httpsclient psycopg2 lxml jinja2
-        pip3 install --upgrade -r $YNH_APP_BASEDIR/conf/requirement_$(lsb_release --codename --short).txt
-
-        # This function was defined when we called "source $code_dir/bin/activate". With this function we undo what "$code_dir/bin/activate" does
-        set +$u_arg;
-        deactivate
-        set -$u_arg;
+        $pip3 install --upgrade setuptools wheel pip
+        $pip3 install --upgrade cffi ndg-httpsclient psycopg2 lxml jinja2
+        $pip3 install --upgrade -r $YNH_APP_BASEDIR/conf/requirement_$(lsb_release --codename --short).txt
     fi
 
     # Apply patch for LDAP auth if needed
diff --git a/scripts/install b/scripts/install
index e52d5b9..19ec431 100644
--- a/scripts/install
+++ b/scripts/install
@@ -172,19 +172,8 @@ chown $app:$app -R $install_dir
 
 ynh_script_progression --message="Creating Synapse config..." --weight=3
 
-# Go in virtualenvironnement
-u_arg='u'
-set +$u_arg;
-source $code_dir/bin/activate
-set -$u_arg;
-
 # Generate config
-python -m synapse.app.homeserver --keys-directory /etc/matrix-$app/ --generate-config --server-name $server_name --report-stats=no -c homeserver.yml
-
-# This function was defined when we called "source $code_dir/bin/activate". With this function we undo what "$code_dir/bin/activate" does
-set +$u_arg;
-deactivate
-set -$u_arg;
+$code_dir/bin/python -m synapse.app.homeserver --keys-directory /etc/matrix-$app/ --generate-config --server-name $server_name --report-stats=no -c homeserver.yml
 
 # Get random values from config
 registration_shared_secret=$(egrep "^registration_shared_secret:" homeserver.yml | cut -d'"' -f2)
diff --git a/scripts/upgrade b/scripts/upgrade
index b53de36..671f89f 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -364,19 +364,8 @@ if [ -z "$registration_shared_secret" ] || [ "$form_secret" == "form_secret: " ]
 then
     ynh_script_progression --message="Generating synapse secret..." --weight=1
 
-    # Go in virtualenvironnement
-    u_arg='u'
-    set +$u_arg;
-    source $code_dir/bin/activate
-    set -$u_arg;
-
     # Generate config and keys
-    python -m synapse.app.homeserver --keys-directory /etc/matrix-$app/ --generate-config --generate-keys --server-name $server_name --report-stats=no -c homeserver.yml
-
-    # This function was defined when we called "source $code_dir/bin/activate". With this function we undo what "$code_dir/bin/activate" does
-    set +$u_arg;
-    deactivate
-    set -$u_arg;
+    $code_dir/bin/python -m synapse.app.homeserver --keys-directory /etc/matrix-$app/ --generate-config --generate-keys --server-name $server_name --report-stats=no -c homeserver.yml
 
     # Get random values from config
     registration_shared_secret=$(egrep "^registration_shared_secret:" homeserver.yml | cut -d'"' -f2)