diff --git a/.changeset/empty-rooms-attack.md b/.changeset/empty-rooms-attack.md
new file mode 100644
index 000000000..0f04b3e57
--- /dev/null
+++ b/.changeset/empty-rooms-attack.md
@@ -0,0 +1,5 @@
+---
+"openapi-fetch": patch
+---
+
+Fix Request parameter being ignored by client methods
diff --git a/packages/openapi-fetch/src/index.js b/packages/openapi-fetch/src/index.js
index 4b226c870..261f5b147 100644
--- a/packages/openapi-fetch/src/index.js
+++ b/packages/openapi-fetch/src/index.js
@@ -109,7 +109,7 @@ export default function createClient(clientOptions) {
 
     let id;
     let options;
-    let request = new CustomRequest(
+    let request = new Request(
       createFinalURL(schemaPath, { baseUrl: finalBaseUrl, params, querySerializer }),
       requestInit,
     );
@@ -143,7 +143,7 @@ export default function createClient(clientOptions) {
             id,
           });
           if (result) {
-            if (result instanceof CustomRequest) {
+            if (result instanceof Request) {
               request = result;
             } else if (result instanceof Response) {
               response = result;
diff --git a/packages/openapi-fetch/test/common/request.test.ts b/packages/openapi-fetch/test/common/request.test.ts
index f5fb7c309..6648d5532 100644
--- a/packages/openapi-fetch/test/common/request.test.ts
+++ b/packages/openapi-fetch/test/common/request.test.ts
@@ -296,7 +296,7 @@ describe("request", () => {
   });
 
   test("uses provided Request class", async () => {
-    // santity check to make sure the profided fetch function is actually called
+    // sanity check to make sure the provided fetch function is actually called
     expect.assertions(1);
 
     class SpecialRequestImplementation extends Request {}
@@ -316,6 +316,30 @@ describe("request", () => {
     await client.GET("/resources");
   });
 
+  describe("custom Request", () => {
+    const ALL_METHODS = [["GET"], ["HEAD"], ["PUT"], ["POST"], ["DELETE"], ["OPTIONS"], ["PATCH"]] as const;
+
+    test.each(ALL_METHODS)("uses custom Request class - %s", async (method) => {
+      // sanity check to make sure the provided fetch function is actually called
+      expect.assertions(1);
+
+      class SpecialRequestImplementation extends Request {}
+
+      const customFetch = async (input: Request) => {
+        // make sure that the request is actually an instance of the custom request we provided
+        expect(input).instanceOf(SpecialRequestImplementation);
+        return Promise.resolve(Response.json({ hello: "world" }));
+      };
+
+      const client = createClient<paths>({
+        baseUrl: "https://fakeurl.example",
+        fetch: customFetch,
+      });
+
+      await (client as any)[method]("/resources", { Request: SpecialRequestImplementation });
+    });
+  });
+
   test("can attach custom properties to request", async () => {
     function createCustomFetch(data: any) {
       const response = {