diff --git a/llvm_diagnostics/messages.py b/llvm_diagnostics/messages.py
index 9a19350..1d539ca 100644
--- a/llvm_diagnostics/messages.py
+++ b/llvm_diagnostics/messages.py
@@ -33,6 +33,9 @@ def end(self):
         """Returns the last index of the Range"""
         return self.start + self.range
 
+    def __hash__(self):
+        return hash((self.start, self.range))
+
 
 @dataclass
 class __Message(Exception):  # pylint: disable=C0103