diff --git a/src/Interpreters/Context.cpp b/src/Interpreters/Context.cpp
index 136d2b1283f..957e9a2bce1 100644
--- a/src/Interpreters/Context.cpp
+++ b/src/Interpreters/Context.cpp
@@ -139,7 +139,6 @@ namespace ErrorCodes
     extern const int INVALID_SETTING_VALUE;
     extern const int UNKNOWN_READ_METHOD;
     extern const int NOT_IMPLEMENTED;
-    extern const int UNKNOWN_FUNCTION;
 }