diff --git a/src/updater/data_source.cpp b/src/updater/data_source.cpp
index a74d3de16..41f75281b 100644
--- a/src/updater/data_source.cpp
+++ b/src/updater/data_source.cpp
@@ -52,6 +52,7 @@ makeSegmentParser(SpeedAndTurnPenaltyFormat format)
     case SpeedAndTurnPenaltyFormat::PARQUET:
         return std::make_unique<ParquetFilesParser<Segment, SpeedSource>>();
     }
+    BOOST_UNREACHABLE_RETURN(nullptr);
 }
 
 std::unique_ptr<FilesParser<Turn, PenaltySource>> makeTurnParser(SpeedAndTurnPenaltyFormat format)