diff --git a/packages/serverless-components/nextjs-cdk-construct/src/index.ts b/packages/serverless-components/nextjs-cdk-construct/src/index.ts
index 6d96ea2f58..2eaec083b3 100644
--- a/packages/serverless-components/nextjs-cdk-construct/src/index.ts
+++ b/packages/serverless-components/nextjs-cdk-construct/src/index.ts
@@ -372,7 +372,7 @@ export class NextJSLambdaEdge extends cdk.Construct {
         // The source contents will be unzipped to and loaded into the S3 bucket
         // at the root '/', we don't want this, we want to maintain the same
         // path on S3 as their local path.
-        destinationKeyPrefix: path.relative(assetsDirectory, assetPath),
+        destinationKeyPrefix: path.posix.relative(assetsDirectory, assetPath),
 
         // Source directories are uploaded with `--sync` this means that any
         // files that don't exist in the source directory, but do in the S3
diff --git a/packages/serverless-components/nextjs-cdk-construct/src/utils/readAssetsDirectory.ts b/packages/serverless-components/nextjs-cdk-construct/src/utils/readAssetsDirectory.ts
index dc46cbe8e3..b7a5f9ca45 100644
--- a/packages/serverless-components/nextjs-cdk-construct/src/utils/readAssetsDirectory.ts
+++ b/packages/serverless-components/nextjs-cdk-construct/src/utils/readAssetsDirectory.ts
@@ -33,11 +33,12 @@ const readAssetsDirectory = (options: {
   assetsDirectory: string;
 }): CacheConfig => {
   const { assetsDirectory } = options;
-  const publicFiles = path.join(assetsDirectory, "public");
-  const staticFiles = path.join(assetsDirectory, "static");
-  const staticPages = path.join(assetsDirectory, "static-pages");
-  const nextData = path.join(assetsDirectory, "_next", "data");
-  const nextStatic = path.join(assetsDirectory, "_next", "static");
+  // Ensure these are posix paths so they are compatible with AWS S3
+  const publicFiles = path.posix.join(assetsDirectory, "public");
+  const staticFiles = path.posix.join(assetsDirectory, "static");
+  const staticPages = path.posix.join(assetsDirectory, "static-pages");
+  const nextData = path.posix.join(assetsDirectory, "_next", "data");
+  const nextStatic = path.posix.join(assetsDirectory, "_next", "static");
 
   return filterNonExistentPathKeys({
     publicFiles: {
diff --git a/packages/serverless-components/nextjs-cdk-construct/src/utils/readInvalidationPathsFromManifest.ts b/packages/serverless-components/nextjs-cdk-construct/src/utils/readInvalidationPathsFromManifest.ts
index 45a7ac2567..b571ab89ec 100644
--- a/packages/serverless-components/nextjs-cdk-construct/src/utils/readInvalidationPathsFromManifest.ts
+++ b/packages/serverless-components/nextjs-cdk-construct/src/utils/readInvalidationPathsFromManifest.ts
@@ -3,7 +3,8 @@ import { OriginRequestDefaultHandlerManifest } from "@sls-next/lambda-at-edge";
 
 const dynamicPathToInvalidationPath = (dynamicPath: string) => {
   const [firstSegment] = dynamicPath.split("/:");
-  return path.join(firstSegment || "/", "*");
+  // Ensure this is posix path as CloudFront needs forward slash in invalidation
+  return path.posix.join(firstSegment || "/", "*");
 };
 
 export const readInvalidationPathsFromManifest = (