diff --git a/malloc_heap.go b/malloc_heap.go
index 4f4e6e0..54846f4 100644
--- a/malloc_heap.go
+++ b/malloc_heap.go
@@ -1,5 +1,5 @@
-//go:build appengine || windows || wasm || tinygo.wasm
-// +build appengine windows wasm tinygo.wasm
+//go:build appengine || windows || wasm || tinygo.wasm || js
+// +build appengine windows wasm tinygo.wasm js
 
 package fastcache
 
diff --git a/malloc_mmap.go b/malloc_mmap.go
index f9c18aa..c636b38 100644
--- a/malloc_mmap.go
+++ b/malloc_mmap.go
@@ -1,5 +1,5 @@
-//go:build !appengine && !windows && !wasm && !tinygo.wasm
-// +build !appengine,!windows,!wasm,!tinygo.wasm
+//go:build !appengine && !windows && !wasm && !tinygo.wasm && !js
+// +build !appengine,!windows,!wasm,!tinygo.wasm,!js
 
 package fastcache