diff --git a/.changeset/twelve-cooks-tickle.md b/.changeset/twelve-cooks-tickle.md
new file mode 100644
index 000000000..bf1bf5b8a
--- /dev/null
+++ b/.changeset/twelve-cooks-tickle.md
@@ -0,0 +1,5 @@
+---
+'astro': major
+---
+
+A trailing slash will not be automatically appended to `import.meta.env.SITE`. Instead, it will be the value of the `site` config as is. This may affect usages of `${import.meta.env.SITE}image.png`, which will need to be updated accordingly.
diff --git a/packages/astro/src/core/config/schema.ts b/packages/astro/src/core/config/schema.ts
index eff69ca4a..69380ee77 100644
--- a/packages/astro/src/core/config/schema.ts
+++ b/packages/astro/src/core/config/schema.ts
@@ -57,11 +57,7 @@ export const AstroConfigSchema = z.object({
 		.optional()
 		.default(ASTRO_CONFIG_DEFAULTS.outDir)
 		.transform((val) => new URL(val)),
-	site: z
-		.string()
-		.url()
-		.optional()
-		.transform((val) => (val ? appendForwardSlash(val) : val)),
+	site: z.string().url().optional(),
 	base: z.string().optional().default(ASTRO_CONFIG_DEFAULTS.base),
 	trailingSlash: z
 		.union([z.literal('always'), z.literal('never'), z.literal('ignore')])