diff --git a/components/core/src/clp_s/search/antlr_common/ErrorListener.hpp b/components/core/src/clp_s/search/antlr_common/ErrorListener.hpp
new file mode 100644
index 000000000..8b05a29ca
--- /dev/null
+++ b/components/core/src/clp_s/search/antlr_common/ErrorListener.hpp
@@ -0,0 +1,30 @@
+#ifndef CLP_S_SEARCH_ANTLRCOMMON_ERRORLISTENER_HPP
+#define CLP_S_SEARCH_ANTLRCOMMON_ERRORLISTENER_HPP
+#include <antlr4-runtime.h>
+
+namespace clp_s::search::antlr_common {
+class ErrorListener : public antlr4::BaseErrorListener {
+public:
+    void syntaxError(
+            antlr4::Recognizer* recognizer,
+            antlr4::Token* offending_symbol,
+            size_t line,
+            size_t char_position_in_line,
+            std::string const& msg,
+            std::exception_ptr e
+    ) override {
+        m_error = true;
+        m_error_message = msg;
+    }
+
+    bool error() const { return m_error; }
+
+    std::string const& message() const { return m_error_message; }
+
+private:
+    bool m_error{false};
+    std::string m_error_message;
+};
+}  // namespace clp_s::search::antlr_common
+
+#endif  // CLP_S_SEARCH_ANTLRCOMMON_ERRORLISTENER_HPP
diff --git a/components/core/src/clp_s/search/kql/CMakeLists.txt b/components/core/src/clp_s/search/kql/CMakeLists.txt
index ee36ee124..b15990180 100644
--- a/components/core/src/clp_s/search/kql/CMakeLists.txt
+++ b/components/core/src/clp_s/search/kql/CMakeLists.txt
@@ -8,6 +8,7 @@ ANTLR_TARGET(
 add_library(
         kql
         ../../Utils.hpp
+        ../antlr_common/ErrorListener.hpp
         ../AndExpr.hpp
         ../BooleanLiteral.hpp
         ../ColumnDescriptor.hpp
diff --git a/components/core/src/clp_s/search/kql/kql.cpp b/components/core/src/clp_s/search/kql/kql.cpp
index fa560cef5..80c9d0acf 100644
--- a/components/core/src/clp_s/search/kql/kql.cpp
+++ b/components/core/src/clp_s/search/kql/kql.cpp
@@ -13,6 +13,7 @@
 
 #include "../../Utils.hpp"
 #include "../AndExpr.hpp"
+#include "../antlr_common/ErrorListener.hpp"
 #include "../BooleanLiteral.hpp"
 #include "../ColumnDescriptor.hpp"
 #include "../DateLiteral.hpp"
@@ -25,31 +26,10 @@
 
 using namespace antlr4;
 using namespace kql;
+using clp_s::search::antlr_common::ErrorListener;
 
 namespace clp_s::search::kql {
-class ErrorListener : public BaseErrorListener {
-public:
-    void syntaxError(
-            Recognizer* recognizer,
-            Token* offending_symbol,
-            size_t line,
-            size_t char_position_in_line,
-            std::string const& msg,
-            std::exception_ptr e
-    ) override {
-        m_error = true;
-        m_error_message = msg;
-    }
-
-    bool error() const { return m_error; }
-
-    std::string const& message() const { return m_error_message; }
-
-private:
-    bool m_error{false};
-    std::string m_error_message;
-};
-
+namespace {
 class ParseTreeVisitor : public KqlBaseVisitor {
 private:
     static void
@@ -224,6 +204,7 @@ class ParseTreeVisitor : public KqlBaseVisitor {
         return base;
     }
 };
+}  // namespace
 
 std::shared_ptr<Expression> parse_kql_expression(std::istream& in) {
     ErrorListener lexer_error_listener;
diff --git a/components/core/src/clp_s/search/sql/CMakeLists.txt b/components/core/src/clp_s/search/sql/CMakeLists.txt
index af2a8ef81..dde7f27cc 100644
--- a/components/core/src/clp_s/search/sql/CMakeLists.txt
+++ b/components/core/src/clp_s/search/sql/CMakeLists.txt
@@ -8,6 +8,7 @@ ANTLR_TARGET(
 add_library(
         sql
         ../../Utils.hpp
+        ../antlr_common/ErrorListener.hpp
         ../AndExpr.hpp
         ../BooleanLiteral.hpp
         ../ColumnDescriptor.hpp
diff --git a/components/core/src/clp_s/search/sql/sql.cpp b/components/core/src/clp_s/search/sql/sql.cpp
index 4004e8a17..53c9d560b 100644
--- a/components/core/src/clp_s/search/sql/sql.cpp
+++ b/components/core/src/clp_s/search/sql/sql.cpp
@@ -5,6 +5,7 @@
 #include <antlr4-runtime.h>
 #include <spdlog/spdlog.h>
 
+#include "../antlr_common/ErrorListener.hpp"
 #include "../EmptyExpr.hpp"
 #include "SqlBaseVisitor.h"
 #include "SqlLexer.h"
@@ -12,6 +13,7 @@
 
 using namespace antlr4;
 using namespace sql;
+using clp_s::search::antlr_common::ErrorListener;
 
 namespace clp_s::search::sql {
 class ErrorListener : public BaseErrorListener {
@@ -37,10 +39,12 @@ class ErrorListener : public BaseErrorListener {
     std::string m_error_message;
 };
 
+namespace {
 class ParseTreeVisitor : public SqlBaseVisitor {
 public:
     std::any visitStart(SqlParser::StartContext* ctx) override { return EmptyExpr::create(); }
 };
+}  // namespace
 
 std::shared_ptr<Expression> parse_sql_expression(std::istream& in) {
     ErrorListener lexer_error_listener;