diff --git a/optimizeimages.py b/optimizeimages.py
index 7bb35a3..6fe8b78 100644
--- a/optimizeimages.py
+++ b/optimizeimages.py
@@ -36,14 +36,14 @@ def optimize_image(imgpath, imgformat, optimizeimg):
             # 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"),
+            subprocess.Popen([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,
+            subprocess.Popen([optipng, imgpath], stderr=subprocess.STDOUT,
                 stdout=subprocess.PIPE).communicate()[0]
-            subprocess.Popen(shlex.split(advdef + " -z4 " + imgpath), stderr=subprocess.STDOUT,
+            subprocess.Popen([advdef, "-z4",imgpath], stderr=subprocess.STDOUT,
                 stdout=subprocess.PIPE).communicate()[0]