diff --git a/src/Databases/DatabaseOrdinary.cpp b/src/Databases/DatabaseOrdinary.cpp
index d99e77a4fb8..e53bccfedc4 100644
--- a/src/Databases/DatabaseOrdinary.cpp
+++ b/src/Databases/DatabaseOrdinary.cpp
@@ -37,7 +37,6 @@ namespace DB
 namespace ErrorCodes
 {
     extern const int LOGICAL_ERROR;
-    extern const int UNKNOWN_TABLE;
 }
 
 static constexpr size_t METADATA_FILE_BUFFER_SIZE = 32768;