diff --git a/src/AggregateFunctions/QuantileTDigest.h b/src/AggregateFunctions/QuantileTDigest.h
index 83ea3b9496c..d578d3ca0c0 100644
--- a/src/AggregateFunctions/QuantileTDigest.h
+++ b/src/AggregateFunctions/QuantileTDigest.h
@@ -14,6 +14,7 @@ namespace DB
 namespace ErrorCodes
 {
     extern const int TOO_LARGE_ARRAY_SIZE;
+    extern const int CANNOT_PARSE_INPUT_ASSERTION_FAILED;
 }