diff --git a/tdbms/install.sh b/tdbms/install.sh
index 9f067ea..16b854f 100644
--- a/tdbms/install.sh
+++ b/tdbms/install.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 
-# This script performs the installation of the TDBMS server
+# This script performs the installation of the Tanabata DBMS server
 
 if [ "$EUID" -ne 0 ]; then
   echo "Please run as root"
   exit 1
 fi
 
-SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
+cd "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
 
 getent group tanabata &>/dev/null || groupadd -g 42776 tanabata
 id tanabata &>/dev/null || useradd -u 42776 -g 42776 tanabata
@@ -56,19 +56,25 @@ fi
 chown 42776:42776 /var/log/tanabata
 chmod 2755 /var/log/tanabata
 
-if [ ! -d "$SCRIPT_DIR/../build" ]; then
-  mkdir "$SCRIPT_DIR/../build"
+if [ -d ../build ]; then
+  rm -r ../build/*
+else
+  mkdir ../build
+  if [ -d ../build ]; then
+    echo "FATAL: failed to create build directory"
+    exit 1
+  fi
 fi
-if ! (cmake -S "$SCRIPT_DIR/.." -B "$SCRIPT_DIR/../build" && cmake --build "$SCRIPT_DIR/../build" --target tdbms); then
+if ! (cmake -S .. -B ../build && cmake --build ../build --target tdbms); then
   echo "FATAL: failed to build TDBMS server"
   exit 1
 fi
-mv -f "$SCRIPT_DIR/../build/tdbms" /usr/bin/
+mv -f ../build/tdbms /usr/bin/
 chown 0:0 /usr/bin/tdbms
 chmod 0755 /usr/bin/tdbms
 
-if ! cp "$SCRIPT_DIR/tdbms.service" /etc/systemd/system/; then
-  echo "FATAL: sailed to copy 'tdbms.service' to '/etc/systemd/system'"
+if ! cp ./tdbms.service /etc/systemd/system/; then
+  echo "FATAL: failed to copy 'tdbms.service' to '/etc/systemd/system'"
 fi
 chown 0:0 /etc/systemd/system/tdbms.service
 chmod 0644 /etc/systemd/system/tdbms.service