diff --git a/integration/nest-application/sse/e2e/express.spec.ts b/integration/nest-application/sse/e2e/express.spec.ts
index 664fa3e12..483e1a75a 100644
--- a/integration/nest-application/sse/e2e/express.spec.ts
+++ b/integration/nest-application/sse/e2e/express.spec.ts
@@ -24,7 +24,7 @@ describe('Sse (Express Application)', () => {
           fetch(input, {
             ...init,
             headers: {
-              ...init.headers,
+              ...init?.headers,
               connection: 'keep-alive',
             },
           }),
@@ -68,7 +68,7 @@ describe('Sse (Express Application)', () => {
           fetch(input, {
             ...init,
             headers: {
-              ...init.headers,
+              ...init?.headers,
               connection: 'keep-alive',
             },
           }),
diff --git a/integration/nest-application/sse/e2e/fastify.spec.ts b/integration/nest-application/sse/e2e/fastify.spec.ts
index 0c895ac73..98823c5f0 100644
--- a/integration/nest-application/sse/e2e/fastify.spec.ts
+++ b/integration/nest-application/sse/e2e/fastify.spec.ts
@@ -29,7 +29,7 @@ describe('Sse (Fastify Application)', () => {
           fetch(input, {
             ...init,
             headers: {
-              ...init.headers,
+              ...init?.headers,
               connection: 'keep-alive',
             },
           }),
@@ -75,7 +75,7 @@ describe('Sse (Fastify Application)', () => {
           fetch(input, {
             ...init,
             headers: {
-              ...init.headers,
+              ...init?.headers,
               connection: 'keep-alive',
             },
           }),