diff --git a/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts b/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts
index c0d21d282..00c902554 100644
--- a/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts
+++ b/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts
@@ -136,7 +136,7 @@ export namespace DocumentSnapshot {
 
         if (normalizedPath.endsWith('node_modules/svelte/types/index.d.ts')) {
             const startIdx = originalText.indexOf(`declare module '*.svelte' {`);
-            const endIdx = originalText.indexOf(`}`, originalText.indexOf(';', startIdx)) + 1;
+            const endIdx = originalText.indexOf(`\n}`, startIdx + 1) + 2;
             originalText =
                 originalText.substring(0, startIdx) +
                 ' '.repeat(endIdx - startIdx) +
diff --git a/packages/typescript-plugin/src/index.ts b/packages/typescript-plugin/src/index.ts
index 1e1bab9d4..b5e572508 100644
--- a/packages/typescript-plugin/src/index.ts
+++ b/packages/typescript-plugin/src/index.ts
@@ -67,8 +67,7 @@ function init(modules: { typescript: typeof ts }): ts.server.PluginModule {
                 if (snapshot) {
                     const originalText = snapshot.getText(0, snapshot.getLength());
                     const startIdx = originalText.indexOf(`declare module '*.svelte' {`);
-                    const endIdx =
-                        originalText.indexOf(`}`, originalText.indexOf(';', startIdx)) + 1;
+                    const endIdx = originalText.indexOf(`\n}`, startIdx + 1) + 2;
                     return modules.typescript.ScriptSnapshot.fromString(
                         originalText.substring(0, startIdx) +
                             ' '.repeat(endIdx - startIdx) +