diff --git a/sources/logger.c b/sources/logger.c
index 77718ef78..9fb6a3494 100644
--- a/sources/logger.c
+++ b/sources/logger.c
@@ -542,7 +542,7 @@ extern void od_logger_write_plain(od_logger_t *logger, od_logger_level_t level,
 
 	int len = strlen(string);
 	char output[len + OD_LOGLINE_MAXLEN];
-	va_list empty_va_list;
+	va_list empty_va_list = { 0 };
 	len = od_logger_format(logger, level, context, client, server, string,
 			       empty_va_list, output, len + 100);