diff --git a/include/proxysql_gtid.h b/include/proxysql_gtid.h
index 44d480e08..68931c057 100644
--- a/include/proxysql_gtid.h
+++ b/include/proxysql_gtid.h
@@ -28,9 +28,9 @@ class TrxId_Interval {
 		const bool merge(const TrxId_Interval& other);
 
 		const int cmp(const TrxId_Interval& other);
-		const bool operator<(const TrxId_Interval& other);
-		const bool operator==(const TrxId_Interval& other);
-		const bool operator!=(const TrxId_Interval& other);
+bool operator<(const TrxId_Interval& other) const;
+bool operator==(const TrxId_Interval& other) const;
+bool operator!=(const TrxId_Interval& other) const;
 };
 
 // Encapsulates a map of UUID -> trxid intervals.
diff --git a/lib/proxysql_gtid.cpp b/lib/proxysql_gtid.cpp
index 0f3b423de..d63eeba7d 100644
--- a/lib/proxysql_gtid.cpp
+++ b/lib/proxysql_gtid.cpp
@@ -158,15 +158,15 @@ const int TrxId_Interval::cmp(const TrxId_Interval& other) {
 	return 0;
 }
 
-const bool TrxId_Interval::operator<(const TrxId_Interval& other) {
+bool TrxId_Interval::operator<(const TrxId_Interval& other) const {
 	return cmp(other) == -1;
 }
 
-const bool TrxId_Interval::operator==(const TrxId_Interval& other) {
+bool TrxId_Interval::operator==(const TrxId_Interval& other) const {
 	return cmp(other) == 0;
 }
 
-const bool TrxId_Interval::operator!=(const TrxId_Interval& other) {
+bool TrxId_Interval::operator!=(const TrxId_Interval& other) const {
 	return cmp(other) != 0;
 }