diff --git a/cutde/gpu_backend.py b/cutde/gpu_backend.py
index bebc980..c3db02b 100644
--- a/cutde/gpu_backend.py
+++ b/cutde/gpu_backend.py
@@ -9,9 +9,9 @@
 
 
 def compare(a, b):
-    if type(a) != type(b):
+    if isinstance(a, type(b)):
         return False
-    if type(a) is list or type(a) is tuple:
+    if isinstance(a, list) or isinstance(a, tuple):
         if len(a) != len(b):
             return False
         comparisons = [compare(av, bv) for av, bv in zip(a, b)]