diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 39fc4cc22..a5e45c264 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,6 +4,7 @@ Release History
 Unreleased: mitmproxy next
 ==========================
 
+* Fix query parameters in asgiapp addon (@jpstotz) 
 * --- TODO: add new PRs above this line ---
 
 * ... and various other fixes, documentation improvements, dependency version bumps, etc.
diff --git a/mitmproxy/addons/asgiapp.py b/mitmproxy/addons/asgiapp.py
index ac4f935c8..5edb6ac84 100644
--- a/mitmproxy/addons/asgiapp.py
+++ b/mitmproxy/addons/asgiapp.py
@@ -55,7 +55,7 @@ def make_scope(flow: http.HTTPFlow) -> dict:
     # (byte string) – URL portion after the ?, percent-encoded.
     query_string: bytes
     if len(quoted_path) > 1:
-        query_string = quoted_path[1].encode()
+        query_string = urllib.parse.unquote(quoted_path[1]).encode()
     else:
         query_string = b""