diff --git a/build.py b/build.py
index ce9a09ef6..5c53e4fc8 100755
--- a/build.py
+++ b/build.py
@@ -512,7 +512,7 @@ def main():
         system2('pip3 install -r requirements.txt')
         system2(
             f'python3 ./generate.py -f ../../{res_dir} -o . -e ../../{res_dir}/rustdesk-{version}-win7-install.exe')
-        system2('mv ../../{res_dir}/rustdesk-{version}-win7-install.exe ../..')
+        system2(f'mv ../../{res_dir}/rustdesk-{version}-win7-install.exe ../..')
     elif os.path.isfile('/usr/bin/pacman'):
         # pacman -S -needed base-devel
         system2("sed -i 's/pkgver=.*/pkgver=%s/g' res/PKGBUILD" % version)