diff --git a/piku.py b/piku.py
index bcbc964..e0a4d12 100755
--- a/piku.py
+++ b/piku.py
@@ -261,10 +261,10 @@ def parse_procfile(filename):
                 # Check for cron patterns
                 if kind == "cron":
                     limits = [59, 24, 31, 12, 7]
-                    matches = match(CRON_REGEXP, command)
+                    matches = match(CRON_REGEXP, command).groups()
                     if matches:
                         for i in range(len(limits)):
-                            if int(matches[i + 1].replace("*/", "").replace("*", "1")) > limits[i]:
+                            if int(matches[i].replace("*/", "").replace("*", "1")) > limits[i]:
                                 raise ValueError
                 workers[kind] = command
             except Exception: