diff --git a/config_api.c b/config_api.c
index b62e41c..2b6a6cf 100644
--- a/config_api.c
+++ b/config_api.c
@@ -41,7 +41,7 @@ static void on_change(config_t *conf)
 int config_open(config_t *conf, const char *filename, int flag)
 {
 	struct stat st;
-	char mode[2];
+	char mode[3];
 	
 	/* set fopen() mode or return if flag is not valid */
 	if (flag == C_WRITE) {