diff --git a/.changeset/eleven-wombats-begin.md b/.changeset/eleven-wombats-begin.md
new file mode 100644
index 000000000..b1c9220f9
--- /dev/null
+++ b/.changeset/eleven-wombats-begin.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+fix: handle closing tags in attributes when detecting script language
diff --git a/packages/vite-plugin-svelte/src/utils/compile.js b/packages/vite-plugin-svelte/src/utils/compile.js
index dc9dfd4de..052d7d80a 100644
--- a/packages/vite-plugin-svelte/src/utils/compile.js
+++ b/packages/vite-plugin-svelte/src/utils/compile.js
@@ -7,7 +7,8 @@ import { log } from './log.js';
 import { createInjectScopeEverythingRulePreprocessorGroup } from './preprocess.js';
 import { mapToRelative } from './sourcemaps.js';
 
-const scriptLangRE = /<script [^>]*lang=["']?([^"' >]+)["']?[^>]*>/;
+const scriptLangRE =
+	/<script (?:[^>]*|(?:[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)\s+)*)lang=["']?([^"' >]+)["']?[^>]*>/;
 
 import { isSvelte3 } from './svelte-version.js';