diff --git a/cronwrapper/__init__.py b/cronwrapper/__init__.py
index b586553..55d07b9 100755
--- a/cronwrapper/__init__.py
+++ b/cronwrapper/__init__.py
@@ -207,10 +207,16 @@ def main():
 
     previous_runs = {}
     for root, dirs, files in os.walk(os.path.join(args.cachedir[0], args.name)):
-        previous_runs = {
-                os.path.join(root, d): datetime.datetime.strptime(d, time_format) 
-                for d in dirs 
-                if datetime.datetime.strptime(d, time_format) < datetime.datetime.strptime(nowstr, time_format)}
+        for d in dirs:
+            if datetime.datetime.strptime(d, time_format) < datetime.datetime.strptime(nowstr, time_format):
+                with open(os.path.join(root, d, 'result'), 'r') as f:
+                    try:
+                        retcode = f.read().splitlines()[-1]
+                    except IndexError:
+                        # Previous run is probably not completed yet, ignore
+                        # this entry
+                        continue
+                previous_runs[os.path.join(root, d)] = datetime.datetime.strptime(d, time_format)
         break
 
     if success: