diff --git a/src/server/slavefuncs.c b/src/server/slavefuncs.c
--- a/src/server/slavefuncs.c
+++ b/src/server/slavefuncs.c
@@ -310,13 +310,13 @@ int exec_blender(char *input, char *outp
 
   fprintf(stderr,"Preparing to execute command: %s -b %s -o %s -f %s\n", command, input, output, frame_str);
 
-  char buf[10];
+  char buf[20];
   struct execio *testrem;
   size_t readlen;
 
   fprintf(stderr,"Executing: %s\n", frame_str);
   ret = execio_open(&testrem, command, cmd);
-  buf[20] = '\0';
+  buf[19] = '\0';
   while(!execio_read(testrem, buf, 20, &readlen))
     {
       if(readlen > 20) {