diff --git a/fetch-macOS.py b/fetch-macOS.py
index f4d7e36..b540db9 100755
--- a/fetch-macOS.py
+++ b/fetch-macOS.py
@@ -87,8 +87,8 @@ class ReplicationError(Exception):
 
 
 def cmd_exists(cmd):
-    return subprocess.call("type " + cmd, shell=True,
-                           stdout=subprocess.PIPE, stderr=subprocess.PIPE) == 0
+    proc subprocess.Popen("type " + cmd, shell=True,
+                           stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
 
 def replicate_url(full_url,