diff --git a/extension/test/assets.test.ts b/extension/test/assets.test.ts
index cd6551fe..6fbda287 100644
--- a/extension/test/assets.test.ts
+++ b/extension/test/assets.test.ts
@@ -64,7 +64,9 @@ describe('extension asset packs', function () {
   });
 
   it('puts cc65 and SDCC 3.x in their own packs, with the tools that hand off to them', function () {
-    for (var f of ['src/worker/wasm/cc65.wasm', 'src/worker/wasm/ca65.wasm', 'src/worker/wasm/ld65.wasm', 'src/worker/fs/cc65-fs-nes.zip']) {
+    for (var f of ['src/worker/wasm/cc65.wasm', 'src/worker/wasm/ca65.wasm', 'src/worker/wasm/ld65.wasm', 'src/worker/fs/cc65-fs-nes.zip',
+      'src/worker/wasm/fastbasic-int.js', 'src/worker/wasm/fastbasic-int.wasm',
+      'src/worker/wasm/fastbasic-fp.js', 'src/worker/wasm/fastbasic-fp.wasm']) {
       assert.equal(packForFile(f), 'cc65', f);
     }
     for (var f of ['src/worker/wasm/sdcc.wasm', 'src/worker/wasm/sdasgb.js', 'src/worker/wasm/sdldz80.wasm', 'src/worker/fs/fssdcc.data', 'src/worker/fs/fssdcc.js.metadata']) {
diff --git a/src/tools/assetpacks.ts b/src/tools/assetpacks.ts
index 6847816e..5b2c2117 100644
--- a/src/tools/assetpacks.ts
+++ b/src/tools/assetpacks.ts
@@ -63,10 +63,11 @@ const EXTRA_FILES_RE = new RegExp('^src/worker/(' + [
   'fs/(oscar64-fs|cc2600-fs|cc7800-fs|sdcc-fs)\\.zip',
 ].join('|') + ')');
 
-// cc65 and SDCC 3.x (SDCC 4.x is in extra) each serve a family of platforms,
+// cc65 (with fastbasic, which always assembles with ca65) and SDCC 3.x
+// (SDCC 4.x is in extra) each serve a family of platforms,
 // so they get their own packs: a NES user never downloads SDCC, nor a Game Boy
 // user cc65's 10MB of per-target filesystems.
-const CC65_FILES_RE = /^src\/worker\/(wasm\/(cc65|ca65|ld65)\.(js|wasm)|fs\/cc65-fs-[^/]+\.zip)$/;
+const CC65_FILES_RE = /^src\/worker\/(wasm\/(cc65|ca65|ld65|fastbasic-int|fastbasic-fp)\.(js|wasm)|fs\/cc65-fs-[^/]+\.zip)$/;
 const SDCC_FILES_RE = /^src\/worker\/(wasm\/(sdcc|sdasz80|sdasgb|sdldz80)\.(js|wasm)|fs\/fssdcc\.[^/]+)$/;
 
 /**