diff --git a/CHANGES.md b/CHANGES.md
index f90e9790..f6593d9e 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@
 ### titiler.core
 
 * Add layer control to map viewer template (author @hrodmn, https://github.com/developmentseed/titiler/pull/1051)
+* improve query string handling in LowerCaseQueryStringMiddleware using urlencode (author @pratapvardhan, https://github.com/developmentseed/titiler/pull/1050)
 
 ### titiler.application
 
diff --git a/src/titiler/core/titiler/core/middleware.py b/src/titiler/core/titiler/core/middleware.py
index 0d19eb68..821d7491 100644
--- a/src/titiler/core/titiler/core/middleware.py
+++ b/src/titiler/core/titiler/core/middleware.py
@@ -3,8 +3,8 @@
 import logging
 import re
 import time
-import urllib.parse
 from typing import Optional, Set
+from urllib.parse import urlencode
 
 from fastapi.logger import logger
 from starlette.datastructures import MutableHeaders
@@ -156,14 +156,11 @@ async def __call__(self, scope: Scope, receive: Receive, send: Send):
         """Handle call."""
         if scope["type"] == "http":
             request = Request(scope)
-
             DECODE_FORMAT = "latin-1"
-
-            query_string = ""
-            for k, v in request.query_params.multi_items():
-                query_string += k.lower() + "=" + urllib.parse.quote(v) + "&"
-
-            query_string = query_string[:-1]
+            query_items = [
+                (k.lower(), v) for k, v in request.query_params.multi_items()
+            ]
+            query_string = urlencode(query_items, doseq=True)
             request.scope["query_string"] = query_string.encode(DECODE_FORMAT)
 
         await self.app(scope, receive, send)