diff --git a/optimizeimages.py b/optimizeimages.py
index 8e34a91..120b60b 100644
--- a/optimizeimages.py
+++ b/optimizeimages.py
@@ -19,18 +19,18 @@ import shlex
 
 def optimize_image(imgpath, imgformat, optimizeimg):
     if imgformat == 'png':
-	if optimizeimg == "1" or optimizeimg == "2":
+        if optimizeimg == "1" or optimizeimg == "2":
             # we can't do an atomic replace here because windows is terrible
             # so instead, we make temp files, delete the old ones, and rename
             # the temp files. go windows!
-	    subprocess.Popen(shlex.split("pngcrush " + imgpath + " " + imgpath + ".tmp"),
-		stderr=subprocess.STDOUT, stdout=subprocess.PIPE).communicate()[0]
-	    os.remove(imgpath)
+            subprocess.Popen(shlex.split("pngcrush " + imgpath + " " + imgpath + ".tmp"),
+                stderr=subprocess.STDOUT, stdout=subprocess.PIPE).communicate()[0]
+            os.remove(imgpath)
             os.rename(imgpath+".tmp", imgpath)
 
-	if optimizeimg == "2":
-	    subprocess.Popen(shlex.split("optipng " + imgpath), stderr=subprocess.STDOUT,
-	        stdout=subprocess.PIPE).communicate()[0]
-	    subprocess.Popen(shlex.split("advdef -z4 " + imgpath), stderr=subprocess.STDOUT,
-	    	stdout=subprocess.PIPE).communicate()[0]
+        if optimizeimg == "2":
+            subprocess.Popen(shlex.split("optipng " + imgpath), stderr=subprocess.STDOUT,
+                stdout=subprocess.PIPE).communicate()[0]
+            subprocess.Popen(shlex.split("advdef -z4 " + imgpath), stderr=subprocess.STDOUT,
+                stdout=subprocess.PIPE).communicate()[0]
 
diff --git a/quadtree.py b/quadtree.py
index d97f3cb..8bd84ee 100644
--- a/quadtree.py
+++ b/quadtree.py
@@ -27,6 +27,7 @@ import logging
 import util
 
 from PIL import Image
+
 from optimizeimages import optimize_image
 
 
@@ -603,7 +604,7 @@ def render_worldtile(chunks, colstart, colend, rowstart, rowend, path, imgformat
     tileimg.save(imgpath)
 
     if optimizeimg:
-	optimize_image(imgpath, imgformat, optimizeimg)
+        optimize_image(imgpath, imgformat, optimizeimg)
 
     with open(hashpath, "wb") as hashout:
         hashout.write(digest)