diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b0a823..92c6f75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 Babashka [http-client](https://github.com/babashka/http-client): HTTP client for Clojure and babashka built on java.net.http
 
+## Unreleased
+
+- [#86](https://github.com/babashka/http-client/issues/86): `uri-with-query` no longer decodes the existing query, fragment and user info when `:query-params` are used ([@dylanpulver](https://github.com/dylanpulver))
+
 ## 0.4.24 (2026-07-26)
 
 - [#80](https://github.com/babashka/http-client/issues/80): accept a function of the request URI in `:proxy` to select a proxy per request ([@jeeger](https://github.com/jeeger))
diff --git a/src/babashka/http_client/interceptors.clj b/src/babashka/http_client/interceptors.clj
index b3b52ad..b8596b1 100644
--- a/src/babashka/http_client/interceptors.clj
+++ b/src/babashka/http_client/interceptors.clj
@@ -103,16 +103,16 @@
   "We can't use the URI constructor because it encodes all arguments for us.
   See https://stackoverflow.com/a/77971448/6264"
   [^java.net.URI uri new-query]
-  (let [old-query (.getQuery uri)
+  (let [old-query (.getRawQuery uri)
         new-query (if old-query (str old-query "&" new-query)
                       new-query)]
     (java.net.URI.
      (str (.getScheme uri) "://"
-          (.getAuthority uri)
+          (.getRawAuthority uri)
           (.getRawPath uri)
           (when-let [nq new-query]
             (str "?" nq))
-          (when-let [f (.getFragment uri)]
+          (when-let [f (.getRawFragment uri)]
             (str "#" f))))))
 
 (def query-params
@@ -129,12 +129,12 @@
 (comment
   (def uri (java.net.URI. "https://borkdude:foobar@foobar.net:80/single%2felement?q=1#/dude"))
   (.getScheme uri) ;;=> https
-  (.getSchemeSpecificPart uri) ;;=> //foobar.net/?q=1
-  (.getUserInfo uri) ;;=> nil
-  (.getAuthority uri) ;;=> "foobar.net"
+  (.getSchemeSpecificPart uri) ;;=> "//borkdude:foobar@foobar.net:80/single/element?q=1"
+  (.getUserInfo uri) ;;=> "borkdude:foobar"
+  (.getRawAuthority uri) ;;=> "borkdude:foobar@foobar.net:80"
   (.getRawPath uri) ;;=> "/single%2felement"
-  (.getQuery uri) ;;=> q=1
-  (.getFragment uri) ;;=> nil
+  (.getRawQuery uri) ;;=> "q=1"
+  (.getRawFragment uri) ;;=> "/dude"
   (uri-with-query uri "f=dude%26hello"))
 
 (def form-params
diff --git a/test/babashka/http_client_test.clj b/test/babashka/http_client_test.clj
index bee92a9..844f201 100644
--- a/test/babashka/http_client_test.clj
+++ b/test/babashka/http_client_test.clj
@@ -619,7 +619,24 @@
     (is (=
          "https://borkdude:foobar@foobar.net:80/single%2felement?q=1&q=%26moo#/dude"
          (str (#'i/uri-with-query (java.net.URI. "https://borkdude:foobar@foobar.net:80/single%2felement?q=1#/dude")
-                                  "q=%26moo"))))))
+                                  "q=%26moo"))))
+    (testing "existing query, fragment and user info are not decoded"
+      (is (=
+           "https://example.com/search?q=a%26b&page=2"
+           (str (#'i/uri-with-query (java.net.URI. "https://example.com/search?q=a%26b")
+                                    "page=2"))))
+      (is (=
+           "https://example.com/search?q=a%20b&page=2"
+           (str (#'i/uri-with-query (java.net.URI. "https://example.com/search?q=a%20b")
+                                    "page=2"))))
+      (is (=
+           "https://example.com/p?a=1&page=2#foo%20bar"
+           (str (#'i/uri-with-query (java.net.URI. "https://example.com/p?a=1#foo%20bar")
+                                    "page=2"))))
+      (is (=
+           "https://user:p%40ss@example.com/p?a=1&page=2"
+           (str (#'i/uri-with-query (java.net.URI. "https://user:p%40ss@example.com/p?a=1")
+                                    "page=2")))))))
 
 (deftest ring-client-test
   (testing "inputstring body"