diff --git a/Python/specialize.c b/Python/specialize.c
index 52e2cf96159292..8e04c8372d76c9 100644
--- a/Python/specialize.c
+++ b/Python/specialize.c
@@ -875,6 +875,7 @@ load_method_fail_kind(DesciptorClassification kind)
         case ABSENT:
             return SPEC_FAIL_EXPECTED_ERROR;
     }
+    Py_UNREACHABLE();
 }
 #endif