diff --git a/pytorch_lightning/root_module/memory.py b/pytorch_lightning/root_module/memory.py
index ffcf8572..44f45f35 100644
--- a/pytorch_lightning/root_module/memory.py
+++ b/pytorch_lightning/root_module/memory.py
@@ -50,7 +50,7 @@ class ModelSummary(object):
                 else:
                     out = m(input_)
 
-                if type(input_) is tuple or type(input_) is list:
+                if type(input_) is tuple or type(input_) is list:  # pragma: no cover
                     in_size = []
                     for x in input_:
                         if type(x) is list: