diff --git a/.gitignore b/.gitignore
index c55829b..816f4f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,6 @@ dist
 env
 env3
 
-*.vrt
 *.egg-info
 *.pyc
 
diff --git a/setup.py b/setup.py
index 1a7eb43..3ae2840 100644
--- a/setup.py
+++ b/setup.py
@@ -13,8 +13,7 @@
 
 requirements = [
     'mercantile',
-    'PyYAML',
-    'numpy'
+    'PyYAML'
 ]
 
 scripts = [
diff --git a/wms_downloader/download.py b/wms_downloader/download.py
index f15bb87..cce9a50 100755
--- a/wms_downloader/download.py
+++ b/wms_downloader/download.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 import argparse
+import glob
 import os
 import subprocess
 import yaml
@@ -34,11 +35,19 @@ def main():
     with open(args.config) as f:
         config = yaml.load(f.read())
 
+    create_directory(config)
+    download_images(config)
+    create_vrt_file(config)
+
+
+def create_directory(config):
     try:
         os.makedirs(config['directory'])
     except OSError:
         pass
 
+
+def download_images(config):
     west_range = list(arange(config['bbox']['west'], config['bbox']['east'], config['size']))
     south_range = list(arange(config['bbox']['south'], config['bbox']['north'], config['size']))
 
@@ -71,8 +80,10 @@ def main():
                 args = ['gdal_translate', '-of', 'JPEG', config['tmpfile'], filename]
                 subprocess.check_call(args)
 
-    file_pattern = '%s/*.gdal.tif'
-    args = ['gdalbuildvrt', '-a_srs', config['projection'], '-overwrite', config['vrtfile'], file_pattern]
+
+def create_vrt_file(config):
+    args = ['gdalbuildvrt', '-a_srs', config['projection'], '-overwrite', config['vrtfile']]
+    args += glob.glob('%s/*.gdal.tif' % config['directory'])
     subprocess.check_call(args)