diff --git a/src/standard.c b/src/standard.c
index 0af7c95..e7bc070 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -13,6 +13,7 @@
 #include <ctype.h>
 #include <netdb.h>
 #include <stdarg.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/socket.h>