diff --git a/os/services/shell/shell.c b/os/services/shell/shell.c
index f10852414..1e344dc1a 100644
--- a/os/services/shell/shell.c
+++ b/os/services/shell/shell.c
@@ -106,6 +106,7 @@ shell_output_lladdr(shell_output_func output, const linkaddr_t *lladdr)
 static void
 output_prompt(shell_output_func output)
 {
+  SHELL_OUTPUT(output, "#");
   shell_output_lladdr(output, &linkaddr_node_addr);
   SHELL_OUTPUT(output, "> ");
 }