diff --git a/src/middlewares/parsers/req.parameter.mutator.ts b/src/middlewares/parsers/req.parameter.mutator.ts
index 5ec21763..16dccbce 100644
--- a/src/middlewares/parsers/req.parameter.mutator.ts
+++ b/src/middlewares/parsers/req.parameter.mutator.ts
@@ -297,7 +297,7 @@ export class RequestParameterMutator {
     if (!vs) return;
     for (const v of vs) {
       if (v?.match(RESERVED_CHARS)) {
-        const message = `Parameter '${name}' must be url encoded. It's value may not contain reserved characters.`;
+        const message = `Parameter '${name}' must be url encoded. Its value may not contain reserved characters.`;
         throw new BadRequest({ path: `.query.${name}`, message: message });
       }
     }
diff --git a/test/openapi.spec.ts b/test/openapi.spec.ts
index 3d890e2b..83f23381 100644
--- a/test/openapi.spec.ts
+++ b/test/openapi.spec.ts
@@ -91,7 +91,7 @@ describe(packageJson.name, () => {
             expect(r.body)
               .to.have.property('message')
               .that.equals(
-                "Parameter 'testJson' must be url encoded. It's value may not contain reserved characters.",
+                "Parameter 'testJson' must be url encoded. Its value may not contain reserved characters.",
               );
           }));
 
@@ -150,7 +150,7 @@ describe(packageJson.name, () => {
             expect(r.body)
               .to.have.property('message')
               .that.equals(
-                "Parameter 'testArray' must be url encoded. It's value may not contain reserved characters.",
+                "Parameter 'testArray' must be url encoded. Its value may not contain reserved characters.",
               );
           }));
 
diff --git a/test/query.params.spec.ts b/test/query.params.spec.ts
index 70e01353..8969fbbd 100644
--- a/test/query.params.spec.ts
+++ b/test/query.params.spec.ts
@@ -134,7 +134,7 @@ describe(packageJson.name, () => {
       .then(r => {
         const body = r.body;
         expect(body.message).equals(
-          "Parameter 'value' must be url encoded. It's value may not contain reserved characters.",
+          "Parameter 'value' must be url encoded. Its value may not contain reserved characters.",
         );
       }));