diff --git a/conf/nginx.conf b/conf/nginx.conf
index acf6565..4b36858 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -14,7 +14,7 @@ location __PATH__/ {
 	try_files $uri $uri/ /index.php?$args;
 
 	# Override CSP header to make SSOWAT user panel compatible with kanboard
-	more_set_headers 'Content-Security-Policy: default-src self unsafe-eval data:';
+	more_set_headers "Content-Security-Policy: default-src 'self' 'unsafe-eval' data:;";
 
 	location __PATH__/(?:kanboard|config.php|config.default.php) {
         deny all;