diff --git a/src/Processors/Formats/Impl/JSONRowInputFormat.cpp b/src/Processors/Formats/Impl/JSONRowInputFormat.cpp
index fc4c868b604..fcc7f0f8381 100644
--- a/src/Processors/Formats/Impl/JSONRowInputFormat.cpp
+++ b/src/Processors/Formats/Impl/JSONRowInputFormat.cpp
@@ -7,11 +7,6 @@
 namespace DB
 {
 
-namespace ErrorCodes
-{
-    extern const int INCORRECT_DATA;
-}
-
 JSONRowInputFormat::JSONRowInputFormat(ReadBuffer & in_, const Block & header_, Params params_, const FormatSettings & format_settings_)
     : JSONRowInputFormat(std::make_unique<PeekableReadBuffer>(in_), header_, params_, format_settings_)
 {