diff --git a/scripts/install b/scripts/install
index ad6835c..2735748 100644
--- a/scripts/install
+++ b/scripts/install
@@ -140,7 +140,6 @@ else
     test -e $final_path/bin/python3 || python3 -m venv $final_path
 
     # Install synapse in virtualenv
-    PS1=${PS1:-}
     cp ../conf/virtualenv_activate $final_path/bin/activate
     ynh_replace_string __FINAL_PATH__ $final_path $final_path/bin/activate
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 126b9de..183c100 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -102,7 +102,6 @@ else
     test -e $final_path/bin/python3 || python3 -m venv $final_path
 
     # Install synapse in virtualenv
-    PS1=${PS1:-}
     cp ../conf/virtualenv_activate $final_path/bin/activate
     ynh_replace_string __FINAL_PATH__ $final_path $final_path/bin/activate