diff --git a/.changeset/cold-walls-film.md b/.changeset/cold-walls-film.md
new file mode 100644
index 000000000000..66915def802d
--- /dev/null
+++ b/.changeset/cold-walls-film.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-cloudflare-workers': patch
+---
+
+fix: correctly map prerendered pages when base path is set
diff --git a/packages/adapter-cloudflare-workers/index.js b/packages/adapter-cloudflare-workers/index.js
index 78ed40939dc2..0997c237b028 100644
--- a/packages/adapter-cloudflare-workers/index.js
+++ b/packages/adapter-cloudflare-workers/index.js
@@ -45,13 +45,20 @@ export default function ({ config = 'wrangler.toml' } = {}) {
 				}
 			});
 
+			let prerendered_entries = Array.from(builder.prerendered.pages.entries());
+
+			if (builder.config.kit.paths.base) {
+				prerendered_entries = prerendered_entries.map(([path, { file }]) => [
+					path,
+					{ file: `${builder.config.kit.paths.base}/${file}` }
+				]);
+			}
+
 			writeFileSync(
 				`${tmp}/manifest.js`,
 				`export const manifest = ${builder.generateManifest({
 					relativePath
-				})};\n\nexport const prerendered = new Map(${JSON.stringify(
-					Array.from(builder.prerendered.pages.entries())
-				)});\n`
+				})};\n\nexport const prerendered = new Map(${JSON.stringify(prerendered_entries)});\n`
 			);
 
 			await esbuild.build({