diff --git a/src/Command/UpdateDatabaseCommand.php b/src/Command/UpdateDatabaseCommand.php
index c6cdeef..c0e2891 100644
--- a/src/Command/UpdateDatabaseCommand.php
+++ b/src/Command/UpdateDatabaseCommand.php
@@ -99,7 +99,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $io->title('Update the GeoIP2 database');
         $this->stopwatch->start('update');
 
-        $tmp = sys_get_temp_dir().basename($target);
+        $tmp = sys_get_temp_dir().DIRECTORY_SEPARATOR.basename($target);
 
         $io->comment(sprintf('Beginning download of file: %s', $url));