diff --git a/modules/reitit-core/java-src/reitit/Trie.java b/modules/reitit-core/java-src/reitit/Trie.java
index b7af4c1f..dcfecd0e 100644
--- a/modules/reitit-core/java-src/reitit/Trie.java
+++ b/modules/reitit-core/java-src/reitit/Trie.java
@@ -38,8 +38,8 @@ public class Trie {
     return decode(new String(chars, begin, end - begin), hasPercent, hasPlus);
   }
 
-  public static class Match {
-    public IPersistentMap params;
+  public final static class Match {
+    public final IPersistentMap params;
     public final Object data;
 
     public Match(IPersistentMap params, Object data) {
@@ -47,6 +47,10 @@ public class Trie {
       this.data = data;
     }
 
+    Match assoc(Object key, Object value) {
+      return new Match(params.assoc(key, value), data);
+    }
+
     @Override
     public String toString() {
       Map<Object, Object> m = new HashMap<>();
@@ -174,10 +178,7 @@ public class Trie {
           }
         }
         final Match m = child.match(stop, max, path);
-        if (m != null) {
-          m.params = m.params.assoc(key, decode(new String(path, i, stop - i), hasPercent, hasPlus));
-        }
-        return m;
+        return m != null ? m.assoc(key, decode(new String(path, i, stop - i), hasPercent, hasPlus)) : null;
       }
       return null;
     }
@@ -216,7 +217,7 @@ public class Trie {
     @Override
     public Match match(int i, int max, char[] path) {
       if (i <= max) {
-        return new Match(params.assoc(parameter, decode(path, i, max)), data);
+        return new Match(params, data).assoc(parameter, decode(path, i, max));
       }
       return null;
     }
diff --git a/test/cljc/reitit/ring_test.cljc b/test/cljc/reitit/ring_test.cljc
index b23d41b7..a907fcc4 100644
--- a/test/cljc/reitit/ring_test.cljc
+++ b/test/cljc/reitit/ring_test.cljc
@@ -3,7 +3,8 @@
             [clojure.set :as set]
             [reitit.middleware :as middleware]
             [reitit.ring :as ring]
-            [reitit.core :as r])
+            [reitit.core :as r]
+            [reitit.trie :as trie])
   #?(:clj
      (:import (clojure.lang ExceptionInfo))))
 
@@ -577,3 +578,19 @@
        (fn [{:keys [::r/router]} _ _]
          (is router)))
      {} ::respond ::raise)))
+
+#?(:clj
+   (deftest invalid-path-parameters-parsing-concurrent-requests-277-test
+     (testing "in enough concurrent system, path-parameters can bleed"
+       (doseq [compiler [trie/java-trie-compiler trie/clojure-trie-compiler]]
+         (let [app (ring/ring-handler
+                     (ring/router
+                       ["/:id" (fn [request]
+                                 {:status 200
+                                  :body (-> request :path-params :id)})])
+                     {::trie/trie-compiler compiler})]
+           (dotimes [_ 10]
+             (future
+               (dotimes [n 100000]
+                 (let [body (:body (app {:request-method :get, :uri (str "/" n)}))]
+                   (is (= body (str n))))))))))))