diff --git a/amaranth/lib/wiring.py b/amaranth/lib/wiring.py
index 1122a625f..17a02a442 100644
--- a/amaranth/lib/wiring.py
+++ b/amaranth/lib/wiring.py
@@ -1277,6 +1277,9 @@ def __eq__(self, other):
         """
         return type(self) is type(other) and self.__unflipped == other.__unflipped
 
+    def __hash__(self):
+        return hash(self.__unflipped)
+
     # See the note in `FlippedSignature`. In addition, these accessors also handle flipping of
     # an interface member.