diff --git a/extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/user/UserService.java b/extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/user/UserService.java
index 94763e6f5..d2c0cd725 100644
--- a/extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/user/UserService.java
+++ b/extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/user/UserService.java
@@ -90,7 +90,9 @@ public class UserService {
             StringBuilder userSearchFilter = new StringBuilder();
             userSearchFilter.append("(&");
             userSearchFilter.append(confService.getUserSearchFilter());
-            userSearchFilter.append("(" + escapingService.escapeLDAPSearchFilter(usernameAttribute) + "=*)");
+            userSearchFilter.append("(");
+            userSearchFilter.append(escapingService.escapeLDAPSearchFilter(usernameAttribute));
+            userSearchFilter.append("=*)");
             userSearchFilter.append(")");