diff --git a/setup/linux-installer.py b/setup/linux-installer.py
index fe1b2a9cf2..c55bd57da1 100644
--- a/setup/linux-installer.py
+++ b/setup/linux-installer.py
@@ -639,7 +639,7 @@ def check_version():
     if calibre_version == '%version':
         calibre_version = urllib.urlopen('http://code.calibre-ebook.com/latest').read()
 
-def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None):
+def run_installer(install_dir, isolated, bin_dir, share_dir):
     destdir = os.path.abspath(os.path.expanduser(install_dir or '/opt'))
     if destdir == '/usr/bin':
         prints(destdir, 'is not a valid install location. Choose', end='')
@@ -666,6 +666,9 @@ def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None):
         prints('Run "%s/calibre" to start calibre' % destdir)
     return 0
 
+def main(install_dir=None, isolated=False, bin_dir=None, share_dir=None):
+    run_installer(install_dir, isolated, bin_dir, share_dir)
+
 try:
     __file__
     from_file = True