diff --git a/src/server/slavefuncs.h b/src/server/slavefuncs.h
--- a/src/server/slavefuncs.h
+++ b/src/server/slavefuncs.h
@@ -20,6 +20,7 @@
 #ifndef _DISTREN_SLAVEFUNCS_H
 #define _DISTREN_SLAVEFUNCS_H
 #include "blendjob.h"
+#include <stdio.h>
 
 
 size_t curl_writetodisk(void *ptr, size_t size, size_t nmemb, FILE *stream);