diff --git a/nemu/flake.nix b/nemu/flake.nix
index 3ecac03..95ec4cb 100644
--- a/nemu/flake.nix
+++ b/nemu/flake.nix
@@ -19,6 +19,7 @@
           packages = [
             clang-tools
             rnix-lsp
+            bear
 
             gdb
             jre
diff --git a/nemu/src/monitor/sdb/sdb.c b/nemu/src/monitor/sdb/sdb.c
index 330d199..725bce8 100644
--- a/nemu/src/monitor/sdb/sdb.c
+++ b/nemu/src/monitor/sdb/sdb.c
@@ -49,7 +49,7 @@ static int cmd_c(char *args) {
 
 
 static int cmd_q(char *args) {
-  return 0;
+  return -1;
 }
 
 static int cmd_help(char *args);