diff --git a/.env.sample b/.env.sample
index 072cc51..20e3ac2 100644
--- a/.env.sample
+++ b/.env.sample
@@ -40,7 +40,7 @@ LOGIN_REDIRECT_URL=https://${DOMAIN}
 LOGIN_REDIRECT_URL_FAILURE=https://${DOMAIN}
 LOGOUT_REDIRECT_URL=https://${DOMAIN}
 OIDC_REDIRECT_ALLOWED_HOSTS='["https://auth.${DOMAIN}", "https://${DOMAIN}"]'
-OIDC_AUTH_REQUEST_EXTRA_PARAMS="{'acr_values'='eidas1'}"
+OIDC_AUTH_REQUEST_EXTRA_PARAMS='{"acr_values": "eidas1"}'
 
 ##############################################################################
 # LOGGING