diff --git a/dbms/src/IO/ReadHelpers.cpp b/dbms/src/IO/ReadHelpers.cpp
index 28240bc78d0fd26bf9842e2f722aa65d376f3eb1..1fcb62832ae4048087da8d9b4746e9ca9aa2ae77 100644
--- a/dbms/src/IO/ReadHelpers.cpp
+++ b/dbms/src/IO/ReadHelpers.cpp
@@ -255,7 +255,7 @@ static ReturnType parseJSONEscapeSequence(Vector & s, ReadBuffer & buf)
 {
     static constexpr bool throw_exception = std::is_same_v<ReturnType, void>;
 
-    auto error = [](const char * message [[maybe_unused]], int code)
+    auto error = [](const char * message [[maybe_unused]], int code [[maybe_unused]])
     {
         if constexpr (throw_exception)
             throw Exception(message, code);
@@ -593,7 +593,7 @@ ReturnType readJSONStringInto(Vector & s, ReadBuffer & buf)
 {
     static constexpr bool throw_exception = std::is_same_v<ReturnType, void>;
 
-    auto error = [](const char * message [[maybe_unused]], int code)
+    auto error = [](const char * message [[maybe_unused]], int code [[maybe_unused]])
     {
         if constexpr (throw_exception)
             throw Exception(message, code);