diff --git a/src/mailer.c b/src/mailer.c
index eafa6f3..018518e 100644
--- a/src/mailer.c
+++ b/src/mailer.c
@@ -5,6 +5,7 @@
 
 #include <dirent.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <dlfcn.h>
 #include "callbacks.h"