diff --git a/packages/starlight-openapi/libs/env.d.ts b/packages/starlight-openapi/libs/env.d.ts
new file mode 100644
index 0000000..ed64f0f
--- /dev/null
+++ b/packages/starlight-openapi/libs/env.d.ts
@@ -0,0 +1,7 @@
+interface ImportMetaEnv {
+  readonly BASE_URL: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}
diff --git a/packages/starlight-openapi/libs/path.ts b/packages/starlight-openapi/libs/path.ts
index 9bee38d..65508cc 100644
--- a/packages/starlight-openapi/libs/path.ts
+++ b/packages/starlight-openapi/libs/path.ts
@@ -4,7 +4,13 @@ import type { StarlightOpenAPISchemaConfig } from './schema'
 
 export { slug } from 'github-slugger'
 
-export function getBaseLink(config: StarlightOpenAPISchemaConfig) {
+const base = stripTrailingSlash(import.meta.env.BASE_URL)
+
+/**
+ * Does not take the Astro `base` configuration option into account.
+ * @see {@link getBaseLink} for a link that does.
+ */
+export function getBasePath(config: StarlightOpenAPISchemaConfig) {
   const path = config.base
     .split('/')
     .map((part) => slug(part))
@@ -13,6 +19,16 @@ export function getBaseLink(config: StarlightOpenAPISchemaConfig) {
   return `/${path}/`
 }
 
+/**
+ * Takes the Astro `base` configuration option into account.
+ * @see {@link getBasePath} for a slug that does not.
+ */
+export function getBaseLink(config: StarlightOpenAPISchemaConfig) {
+  const path = stripLeadingSlash(getBasePath(config))
+
+  return path ? `${base}/${path}` : `${base}/`
+}
+
 export function stripLeadingAndTrailingSlashes(path: string): string {
   return stripLeadingSlash(stripTrailingSlash(path))
 }
diff --git a/packages/starlight-openapi/libs/pathItem.ts b/packages/starlight-openapi/libs/pathItem.ts
index 97d2432..be809bc 100644
--- a/packages/starlight-openapi/libs/pathItem.ts
+++ b/packages/starlight-openapi/libs/pathItem.ts
@@ -1,10 +1,10 @@
 import { getOperationsByTag, getWebhooksOperations } from './operation'
-import { getBaseLink } from './path'
+import { getBasePath } from './path'
 import type { Schema } from './schema'
 import { makeSidebarGroup, makeSidebarLink, type SidebarManualGroup } from './starlight'
 
 export function getPathItemSidebarGroups({ config, document }: Schema): SidebarManualGroup['items'] {
-  const baseLink = getBaseLink(config)
+  const baseLink = getBasePath(config)
   const operations = getOperationsByTag(document)
 
   return [...operations.entries()].map(([tag, operations]) =>
@@ -17,7 +17,7 @@ export function getPathItemSidebarGroups({ config, document }: Schema): SidebarM
 }
 
 export function getWebhooksSidebarGroups({ config, document }: Schema): SidebarManualGroup['items'] {
-  const baseLink = getBaseLink(config)
+  const baseLink = getBasePath(config)
   const operations = getWebhooksOperations(document)
 
   if (operations.length === 0) {
diff --git a/packages/starlight-openapi/libs/route.ts b/packages/starlight-openapi/libs/route.ts
index 7078bb6..e6b11d0 100644
--- a/packages/starlight-openapi/libs/route.ts
+++ b/packages/starlight-openapi/libs/route.ts
@@ -1,14 +1,14 @@
 import schemas from 'virtual:starlight-openapi-schemas'
 
 import { getOperationsByTag, getWebhooksOperations, type PathItemOperation } from './operation'
-import { getBaseLink, stripLeadingAndTrailingSlashes } from './path'
+import { getBasePath, stripLeadingAndTrailingSlashes } from './path'
 import type { Schema } from './schema'
 
 export function getSchemaStaticPaths(): StarlighOpenAPIRoute[] {
   return Object.values(schemas).flatMap((schema) => [
     {
       params: {
-        openAPISlug: stripLeadingAndTrailingSlashes(getBaseLink(schema.config)),
+        openAPISlug: stripLeadingAndTrailingSlashes(getBasePath(schema.config)),
       },
       props: {
         schema,
@@ -21,7 +21,7 @@ export function getSchemaStaticPaths(): StarlighOpenAPIRoute[] {
 }
 
 function getPathItemStaticPaths(schema: Schema): StarlighOpenAPIRoute[] {
-  const baseLink = getBaseLink(schema.config)
+  const baseLink = getBasePath(schema.config)
   const operations = getOperationsByTag(schema.document)
 
   return [...operations.entries()].flatMap(([, operations]) =>
@@ -39,7 +39,7 @@ function getPathItemStaticPaths(schema: Schema): StarlighOpenAPIRoute[] {
 }
 
 function getWebhooksStaticPaths(schema: Schema): StarlighOpenAPIRoute[] {
-  const baseLink = getBaseLink(schema.config)
+  const baseLink = getBasePath(schema.config)
   const operations = getWebhooksOperations(schema.document)
 
   return operations.map((operation) => ({
diff --git a/packages/starlight-openapi/libs/schema.ts b/packages/starlight-openapi/libs/schema.ts
index 115c73f..5cbbb86 100644
--- a/packages/starlight-openapi/libs/schema.ts
+++ b/packages/starlight-openapi/libs/schema.ts
@@ -1,7 +1,7 @@
 import { z } from 'astro/zod'
 import type { OpenAPI } from 'openapi-types'
 
-import { getBaseLink, stripLeadingAndTrailingSlashes } from './path'
+import { getBasePath, stripLeadingAndTrailingSlashes } from './path'
 import { getPathItemSidebarGroups, getWebhooksSidebarGroups } from './pathItem'
 import { makeSidebarGroup, makeSidebarLink, type SidebarManualGroup } from './starlight'
 
@@ -32,7 +32,7 @@ export function getSchemaSidebarGroups(schema: Schema): SidebarManualGroup {
   return makeSidebarGroup(
     config.label ?? document.info.title,
     [
-      makeSidebarLink('Overview', getBaseLink(config)),
+      makeSidebarLink('Overview', getBasePath(config)),
       ...getPathItemSidebarGroups(schema),
       ...getWebhooksSidebarGroups(schema),
     ],