diff --git a/.changeset/seven-mice-do.md b/.changeset/seven-mice-do.md
new file mode 100644
index 000000000..39d7f8125
--- /dev/null
+++ b/.changeset/seven-mice-do.md
@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Fix issue with plugins running twice in dev and build
diff --git a/packages/astro/src/core/create-vite.ts b/packages/astro/src/core/create-vite.ts
index 80fd870c0..c8b504ad6 100644
--- a/packages/astro/src/core/create-vite.ts
+++ b/packages/astro/src/core/create-vite.ts
@@ -91,8 +91,6 @@ export async function createVite(inlineConfig: ViteConfigWithSSR, { astroConfig,
 		}
 	}
 
-	// Add in user settings last, followed by any Vite configuration passed in from the parent function (overrides)
-	viteConfig = vite.mergeConfig(viteConfig, astroConfig.vite || {}); // merge in Vite config from astro.config.mjs
 	viteConfig = vite.mergeConfig(viteConfig, inlineConfig); // merge in inline Vite config
 	return viteConfig;
 }