diff --git a/chanfig/flat_dict.py b/chanfig/flat_dict.py
index e877b029..47d70565 100644
--- a/chanfig/flat_dict.py
+++ b/chanfig/flat_dict.py
@@ -1148,6 +1148,9 @@ def _add_indent(self, text: str) -> str:
         text = first + "\n" + text
         return text
 
+    def __hash__(self):
+        return hash(frozenset(self.items()))
+
     def __getstate__(self, *args, **kwargs):
         return self.__dict__