diff --git a/landsat/combine.py b/landsat/combine.py
index 977d28e..0102c92 100644
--- a/landsat/combine.py
+++ b/landsat/combine.py
@@ -13,7 +13,7 @@
 
 # Combine bands into PNG
 meta.update(count = 3, driver='PNG')
-with rasterio.open('output/result.png', 'w+', **meta) as output:
+with rasterio.open("output/result-%s.png" % source, 'w+', **meta) as output:
     for i in range(1, 4):
         print(i)
         output.write_band(i,rasterio.open("data/%s/%s_B%d.TIF" % (source, source, i+3)).read(1))