diff --git a/velox/common/base/VeloxException.h b/velox/common/base/VeloxException.h
index 148ae38f06a2..868943125051 100644
--- a/velox/common/base/VeloxException.h
+++ b/velox/common/base/VeloxException.h
@@ -49,10 +49,6 @@ inline constexpr auto kErrorSourceUser = "USER"_fs;
 /// Errors where the root cause of the problem is an unexpected internal state
 /// in the system.
 inline constexpr auto kErrorSourceRuntime = "RUNTIME"_fs;
-
-/// Errors where the root cause of the problem is some unreliable aspect of the
-/// system are classified with source SYSTEM.
-inline constexpr auto kErrorSourceSystem = "SYSTEM"_fs;
 } // namespace error_source
 
 namespace error_code {