diff --git a/.changeset/cuddly-walls-remember.md b/.changeset/cuddly-walls-remember.md
new file mode 100644
index 0000000000..9057e1ac09
--- /dev/null
+++ b/.changeset/cuddly-walls-remember.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/underscore-redirects': patch
+---
+
+Fixes a regression which used the wrong pattern for dynamic pages
diff --git a/packages/underscore-redirects/src/astro.ts b/packages/underscore-redirects/src/astro.ts
index 8d91847e0d..c8ff5208a5 100644
--- a/packages/underscore-redirects/src/astro.ts
+++ b/packages/underscore-redirects/src/astro.ts
@@ -100,7 +100,7 @@ export function createRedirectsFromAstroRoutes({
 				}
 				_redirects.add({
 					dynamic: true,
-					input: `${base}${route.pattern}`,
+					input: `${base}${pattern}`,
 					target,
 					status: route.type === 'redirect' ? 301 : 200,
 					weight: 1,
@@ -108,7 +108,7 @@ export function createRedirectsFromAstroRoutes({
 			} else {
 				_redirects.add({
 					dynamic: true,
-					input: `${base}${route.pattern}`,
+					input: `${base}${pattern}`,
 					target: dynamicTarget,
 					status: 200,
 					weight: 1,