diff --git a/metomi/rose/config.py b/metomi/rose/config.py
index b75a489b6..d0ec104ce 100644
--- a/metomi/rose/config.py
+++ b/metomi/rose/config.py
@@ -218,7 +218,7 @@ def __eq__(self, other):
             for keys_1, node_1 in self.walk(no_ignore=True):
                 node_2 = other.get(keys_1, no_ignore=True)
                 if (
-                    type(node_1) != type(node_2)
+                    type(node_1) is not type(node_2)
                     or (
                         not isinstance(node_1.value, dict)
                         and node_1.value != node_2.value