diff --git a/CHANGES.md b/CHANGES.md
index dd8dca36d..99c2d98c9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Release Notes
 
+## [unreleased]
+
+- fix `LowerCaseQueryStringMiddleware` unexpectedly truncating query parameters (https://github.com/developmentseed/titiler/pull/677)
+
 ## 0.13.0 (2023-07-27)
 
 * update core requirements to libraries using pydantic **~=2.0**
diff --git a/src/titiler/core/tests/test_case_middleware.py b/src/titiler/core/tests/test_case_middleware.py
index 00b885773..0a13abe7f 100644
--- a/src/titiler/core/tests/test_case_middleware.py
+++ b/src/titiler/core/tests/test_case_middleware.py
@@ -47,3 +47,26 @@ async def route1(value: Annotated[List[str], Query()]):
 
     response = client.get("/route1?VALUE=lorenzori&VALUE=dogs&value=trucks")
     assert response.json() == {"value": ["lorenzori", "dogs", "trucks"]}
+
+
+def test_lowercase_middleware_url_with_query_parameters():
+    """Make sure all query parameters return."""
+    app = FastAPI()
+
+    @app.get("/route1")
+    async def route1(url: List[str] = Query(...)):
+        """route1."""
+        return {"url": url}
+
+    app.add_middleware(LowerCaseQueryStringMiddleware)
+
+    client = TestClient(app)
+
+    url = "https://developmentseed.org?solutions=geospatial&planet=better"
+    url_encoded = (
+        "https%3A%2F%2Fdevelopmentseed.org%3Fsolutions%3Dgeospatial%26planet%3Dbetter"
+    )
+
+    response = client.get(f"/route1?url={url_encoded}")
+
+    assert response.json() == {"url": [url]}
diff --git a/src/titiler/core/titiler/core/middleware.py b/src/titiler/core/titiler/core/middleware.py
index f592c962d..0d19eb688 100644
--- a/src/titiler/core/titiler/core/middleware.py
+++ b/src/titiler/core/titiler/core/middleware.py
@@ -3,6 +3,7 @@
 import logging
 import re
 import time
+import urllib.parse
 from typing import Optional, Set
 
 from fastapi.logger import logger
@@ -160,7 +161,7 @@ async def __call__(self, scope: Scope, receive: Receive, send: Send):
 
             query_string = ""
             for k, v in request.query_params.multi_items():
-                query_string += k.lower() + "=" + v + "&"
+                query_string += k.lower() + "=" + urllib.parse.quote(v) + "&"
 
             query_string = query_string[:-1]
             request.scope["query_string"] = query_string.encode(DECODE_FORMAT)