diff --git a/src/autoProcess.ts b/src/autoProcess.ts
index ef2e5ae4..d8d4d678 100644
--- a/src/autoProcess.ts
+++ b/src/autoProcess.ts
@@ -127,9 +127,23 @@ export function sveltePreprocess(
     }
 
     if (sourceMap && name in SOURCE_MAP_PROP_MAP) {
-      const [propName, value] = SOURCE_MAP_PROP_MAP[name];
+      const [propPath, value] = SOURCE_MAP_PROP_MAP[name];
+      const pathParts = propPath.split('.');
+      let parentObj = opts;
 
-      opts[propName] = value;
+      for (let i = 0; i < pathParts.length - 1; i++) {
+        const propName = pathParts[i];
+
+        if (typeof parentObj[propName] !== 'object') {
+          parentObj[propName] = {};
+        }
+
+        parentObj = parentObj[propName];
+      }
+
+      const propName = pathParts[pathParts.length - 1];
+
+      parentObj[propName] = value;
     }
 
     return opts;
diff --git a/src/modules/language.ts b/src/modules/language.ts
index ae1fbe35..e53ef05f 100644
--- a/src/modules/language.ts
+++ b/src/modules/language.ts
@@ -38,7 +38,7 @@ export function getLanguageDefaults(lang: string): null | Record<string, any> {
 
 export const SOURCE_MAP_PROP_MAP: Record<string, [string, any]> = {
   babel: ['sourceMaps', true],
-  typescript: ['sourceMap', true],
+  typescript: ['compilerOptions.sourceMap', true],
   scss: ['sourceMap', true],
   less: ['sourceMap', {}],
   stylus: ['sourcemap', true],
diff --git a/test/autoProcess/sourceMaps.test.ts b/test/autoProcess/sourceMaps.test.ts
index e24b1ba1..3efcc243 100644
--- a/test/autoProcess/sourceMaps.test.ts
+++ b/test/autoProcess/sourceMaps.test.ts
@@ -84,13 +84,27 @@ describe(`sourcemap generation`, () => {
           [transformerName]: true,
         });
 
-        const [key, val] = SOURCE_MAP_PROP_MAP[transformerName];
+        const [propPath, value] = SOURCE_MAP_PROP_MAP[transformerName];
+        const expectedOptions = {};
+        const pathParts = propPath.split('.');
+        let parentObj = expectedOptions;
+
+        for (let i = 0; i < pathParts.length - 1; i++) {
+          const propName = pathParts[i];
+
+          parentObj[propName] = {};
+          parentObj = parentObj[propName];
+        }
+
+        const propName = pathParts[pathParts.length - 1];
+
+        parentObj[propName] = value;
 
         await preprocess(template, opts);
 
         expect(transformer).toHaveBeenCalledWith(
           expect.objectContaining({
-            options: expect.objectContaining({ [key]: val }),
+            options: expect.objectContaining(expectedOptions),
           }),
         );
       });