diff --git a/bin/shiki.js b/bin/shiki.js
index 38461fb..798f543 100644
--- a/bin/shiki.js
+++ b/bin/shiki.js
@@ -58,7 +58,7 @@ async function main(args) {
     }
 
     if (args[0] === 'themes') {
-        process.stdout.write(JSON.stringify(highlighter.getLoadedThemes()));
+        process.stdout.write(JSON.stringify(Object.keys(shiki.bundledThemes)));
         return;
     }
 
diff --git a/tests/testfiles/alt-bin/shiki.js b/tests/testfiles/alt-bin/shiki.js
index acd09a1..2b3ffe2 100644
--- a/tests/testfiles/alt-bin/shiki.js
+++ b/tests/testfiles/alt-bin/shiki.js
@@ -58,7 +58,7 @@ async function main(args) {
     }
 
     if (args[0] === 'themes') {
-        process.stdout.write(JSON.stringify(highlighter.getLoadedThemes()));
+        process.stdout.write(JSON.stringify(Object.keys(shiki.bundledThemes)));
         return;
     }