diff --git a/pkg/scalers/postgresql_scaler.go b/pkg/scalers/postgresql_scaler.go
index 04ce1af2c27..ef07b0d74ff 100644
--- a/pkg/scalers/postgresql_scaler.go
+++ b/pkg/scalers/postgresql_scaler.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"net"
 	"regexp"
 	"strings"
 	"time"
@@ -202,7 +203,7 @@ func getConnection(ctx context.Context, meta *postgreSQLMetadata, podIdentity ke
 		if err != nil {
 			return nil, err
 		}
-		DBendpoint := fmt.Sprintf("%s:%s", meta.Host, meta.Port)
+		DBendpoint := net.JoinHostPort(meta.Host, meta.Port)
 		password, err := auth.BuildAuthToken(ctx, DBendpoint, meta.AwsRegion, meta.UserName, cfg.Credentials)
 		if err != nil {
 			return nil, err