diff --git a/nemu/flake.nix b/nemu/flake.nix
index 309965d..3ecac03 100644
--- a/nemu/flake.nix
+++ b/nemu/flake.nix
@@ -26,7 +26,7 @@
             gtkwave
           ];
 
-          inputsFrom = [ self.packages.${system}.default ];
+          inputsFrom = [ self.packages.${system}.nemu ];
         };
 
         packages.nemu = with pkgs; stdenv.mkDerivation rec {
diff --git a/nemu/src/monitor/monitor.c b/nemu/src/monitor/monitor.c
index acaed1b..2279ca0 100644
--- a/nemu/src/monitor/monitor.c
+++ b/nemu/src/monitor/monitor.c
@@ -32,8 +32,6 @@ static void welcome() {
   Log("Build time: %s, %s", __TIME__, __DATE__);
   printf("Welcome to %s-NEMU!\n", ANSI_FMT(str(__GUEST_ISA__), ANSI_FG_YELLOW ANSI_BG_RED));
   printf("For help, type \"help\"\n");
-  Log("Exercise: Please remove me in the source code and compile NEMU again.");
-  assert(0);
 }
 
 #ifndef CONFIG_TARGET_AM