diff --git a/src/matcher.ts b/src/matcher.ts
index 4cd6b9d..05e617f 100644
--- a/src/matcher.ts
+++ b/src/matcher.ts
@@ -12,6 +12,14 @@ interface CompiledPath {
   template: string;
 }
 
+function decodePathParameter(value: string): string {
+  try {
+    return decodeURIComponent(value);
+  } catch {
+    return value;
+  }
+}
+
 /**
  * Compile OpenAPI path templates into regexes for efficient matching.
  * E.g. "/users/{id}" → /^\/users\/([^/]+)$/
@@ -79,7 +87,7 @@ export function createMatcher(spec: OpenApiSpec) {
 
       const pathParams: Record<string, string> = {};
       for (let i = 0; i < entry.paramNames.length; i += 1) {
-        pathParams[entry.paramNames[i]] = match[i + 1];
+        pathParams[entry.paramNames[i]] = decodePathParameter(match[i + 1]);
       }
 
       return {
diff --git a/tests/matcher.test.ts b/tests/matcher.test.ts
index 3617276..dedf111 100644
--- a/tests/matcher.test.ts
+++ b/tests/matcher.test.ts
@@ -80,6 +80,18 @@ describe("matchOperation", () => {
     assert.equal(result.pathParams.memberId, "m2");
   });
 
+  it("decodes percent-encoded path parameters", () => {
+    const result = match("GET", "/users/hello%20world%2Bplus");
+    assert.ok(result);
+    assert.equal(result.pathParams.id, "hello world+plus");
+  });
+
+  it("preserves malformed percent-encoded path parameters", () => {
+    const result = match("GET", "/users/bad%2");
+    assert.ok(result);
+    assert.equal(result.pathParams.id, "bad%2");
+  });
+
   it("returns null for unmatched path", () => {
     const result = match("GET", "/unknown");
     assert.equal(result, null);