diff --git a/landsat/tests/test_utils.py b/landsat/tests/test_utils.py
index 7e2f4ac..167e3bd 100644
--- a/landsat/tests/test_utils.py
+++ b/landsat/tests/test_utils.py
@@ -92,18 +92,24 @@ class TestUtils(unittest.TestCase):
     def test_convert_to_integer_list(self):
         # correct input
         r = utils.convert_to_integer_list('1,2,3')
-        self.assertEqual(['1', '2', '3'], r)
+        self.assertEqual([1, 2, 3], r)
 
         # try other cobinations
         r = utils.convert_to_integer_list('1, 2, 3')
-        self.assertEqual(['1', '2', '3'], r)
+        self.assertEqual([1, 2, 3], r)
 
         r = utils.convert_to_integer_list('1s,2df,3d/')
-        self.assertEqual(['1', '2', '3'], r)
+        self.assertEqual([1, 2, 3], r)
 
         r = utils.convert_to_integer_list([1, 3, 4])
         self.assertEqual([1, 3, 4], r)
 
+        r = utils.convert_to_integer_list('1,11,10')
+        self.assertEqual([1, 11, 10], r)
+
+        r = utils.convert_to_integer_list('1,11,10,QA')
+        self.assertEqual([1, 11, 10, 'QA'], r)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/landsat/utils.py b/landsat/utils.py
index b5dc6e3..75e4442 100644
--- a/landsat/utils.py
+++ b/landsat/utils.py
@@ -268,13 +268,13 @@ def convert_to_integer_list(value):
         ['003', '003', '004', '004']
 
     """
-
-    if value and isinstance(value, str):
-        if ',' in value:
-            value = re.sub('[^0-9,]', '', value)
-            new_list = value.split(',')
-        else:
-            new_list = re.findall('[0-9]', value)
-        return new_list if new_list else None
-    else:
+    if isinstance(value, list):
         return value
+    else:
+        s = re.findall('(10|11|QA|[0-9])', value)
+        for k, v in enumerate(s):
+            try:
+                s[k] = int(v)
+            except ValueError:
+                pass
+        return s