diff --git a/src/server/slavefuncs.c b/src/server/slavefuncs.c
--- a/src/server/slavefuncs.c
+++ b/src/server/slavefuncs.c
@@ -200,7 +200,7 @@ int login_user(char *username)
 }
 
 /** Replaces username and key in the slave's conf file */
-void conf_replace(char *username){
+int conf_replace(char *username){
   /* Note: SYSCONFDIR doesn't include a trailing slash */
   int maxlinelen = 120;
   char *fileOrig = SYSCONFDIR "/distrenslave.conf";
diff --git a/src/server/slavefuncs.h b/src/server/slavefuncs.h
--- a/src/server/slavefuncs.h
+++ b/src/server/slavefuncs.h
@@ -24,7 +24,7 @@
 int ssh_keygen();
 int register_user(char *username, char *email);
 int login_user(char *username);
-void conf_replace(char *username);
+int conf_replace(char *username);
 void exec_blender(struct blendjob* blendjob, char *input, char *output, int frame);