diff --git a/src/server/slave.c b/src/server/slave.c
--- a/src/server/slave.c
+++ b/src/server/slave.c
@@ -31,6 +31,7 @@
 #include "protocol.h"
 #include "options.h" // Confuse, etc.
 #include <string.h>
+#include <stdio.h>
 
 int slavestatus = 0; // Ugh global vars