diff --git a/generator/address_parser/tiger_parser.cpp b/generator/address_parser/tiger_parser.cpp
index ea40ea5aba..2a5dbbfbf5 100644
--- a/generator/address_parser/tiger_parser.cpp
+++ b/generator/address_parser/tiger_parser.cpp
@@ -112,5 +112,6 @@ std::string DebugPrint(InterpolType type)
   case InterpolType::Odd: return "Interpol::Odd";
   case InterpolType::Even: return "Interpol::Even";
   }
+  UNREACHABLE();
 }
 } // namespace feature