diff --git a/user.go b/user.go
index 460672e..9356941 100644
--- a/user.go
+++ b/user.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"strings"
 )
 
 const (
@@ -49,13 +50,13 @@ func (a *App) GetUserByIdentifier(identifier string) (*User, error) {
 	var errorText string
 	message := "failed to get Passage User By Identifier"
 	limit := 1
-	ilikeIdentifier := "like:(?i)" + identifier
+	lowerIdentifier := strings.ToLower(identifier)
 	res, err := a.client.ListPaginatedUsersWithResponse(
 		context.Background(),
 		a.ID,
 		&ListPaginatedUsersParams{
 			Limit:      &limit,
-			Identifier: &ilikeIdentifier,
+			Identifier: &lowerIdentifier,
 		},
 	)