diff --git a/src/server/slavefuncs.h b/src/server/slavefuncs.h
--- a/src/server/slavefuncs.h
+++ b/src/server/slavefuncs.h
@@ -22,8 +22,8 @@
 #include "blendjob.h"
 
 void ssh_keygen();
-void register_user(char *username, char *email);
-void login_user(char *username);
+int register_user(char *username, char *email);
+int login_user(char *username);
 void conf_replace(char *username, char *key);
 void exec_blender(struct blendjob* blendjob, char *input, char *output, int frame);