diff --git a/.changeset/curvy-bugs-build.md b/.changeset/curvy-bugs-build.md
new file mode 100644
index 000000000000..4fb178ce47cc
--- /dev/null
+++ b/.changeset/curvy-bugs-build.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: add trailing slash pathname when generating typed routes
diff --git a/packages/kit/src/core/sync/write_types/index.js b/packages/kit/src/core/sync/write_types/index.js
index d51c60a94442..ba3f88d34056 100644
--- a/packages/kit/src/core/sync/write_types/index.js
+++ b/packages/kit/src/core/sync/write_types/index.js
@@ -82,10 +82,21 @@ export function write_all_types(config, manifest_data) {
 			dynamic_routes.push(route_type);
 
 			const pathname = remove_group_segments(route.id);
-			pathnames.add(`\`${replace_required_params(replace_optional_params(pathname))}\` & {}`);
+			const replaced_pathname = replace_required_params(replace_optional_params(pathname));
+			pathnames.add(`\`${replaced_pathname}\` & {}`);
+
+			if (pathname !== '/') {
+				// Support trailing slash
+				pathnames.add(`\`${replaced_pathname + '/'}\` & {}`);
+			}
 		} else {
 			const pathname = remove_group_segments(route.id);
 			pathnames.add(s(pathname));
+
+			if (pathname !== '/') {
+				// Support trailing slash
+				pathnames.add(s(pathname + '/'));
+			}
 		}
 
 		/** @type {Map<string, boolean>} */
diff --git a/packages/kit/src/core/sync/write_types/test/app-types/+page.ts b/packages/kit/src/core/sync/write_types/test/app-types/+page.ts
index 09dea2ca9d96..7da8f0ee9b6a 100644
--- a/packages/kit/src/core/sync/write_types/test/app-types/+page.ts
+++ b/packages/kit/src/core/sync/write_types/test/app-types/+page.ts
@@ -26,9 +26,12 @@ declare let pathname: Pathname;
 pathname = '/nope';
 pathname = '/foo';
 pathname = '/foo/1/2';
+pathname = '/foo/';
+pathname = '/foo/1/2/';
 
 // Test layout groups
 pathname = '/path-a';
+pathname = '/path-a/';
 // @ts-expect-error layout group names are NOT part of the pathname type
 pathname = '/(group)/path-a';