diff --git a/core/mem/mutex_allocator.odin b/core/mem/mutex_allocator.odin
index b8062bca1..7361016c3 100644
--- a/core/mem/mutex_allocator.odin
+++ b/core/mem/mutex_allocator.odin
@@ -1,4 +1,4 @@
-#+build !freestanding
+#+build !freestanding, wasm32, wasm64p32
 package mem
 
 import "core:sync"