diff --git a/lib/lib_rss.php b/lib/lib_rss.php
index 893bed8eb92..79e3f3b1224 100644
--- a/lib/lib_rss.php
+++ b/lib/lib_rss.php
@@ -16,6 +16,17 @@ function str_starts_with(string $haystack, string $needle): bool {
 	}
 }
 
+if (!function_exists('openlog')) {
+	function openlog(string $prefix, int $flags, int $facility): bool {
+		return false;
+	}
+}
+if (!function_exists('syslog')) {
+	function syslog(int $priority, string $message): bool {
+		return false;
+	}
+}
+
 // @phpstan-ignore-next-line
 if (COPY_SYSLOG_TO_STDERR) {
 	openlog('FreshRSS', LOG_CONS | LOG_ODELAY | LOG_PID | LOG_PERROR, LOG_USER);