diff --git a/include/public/atomic_queue/defs.h b/include/public/atomic_queue/defs.h
index d459209c7..a139836f1 100644
--- a/include/public/atomic_queue/defs.h
+++ b/include/public/atomic_queue/defs.h
@@ -54,6 +54,13 @@ static inline void spin_loop_pause() noexcept {
     asm volatile (".insn i 0x0F, 0, x0, x0, 0x010");
 }
 } // namespace atomic_queue
+#elif defined(__wasm__)
+namespace atomic_queue {
+constexpr int CACHE_LINE_SIZE = 64;
+static inline void spin_loop_pause() noexcept {
+    // no instruction yet, see https://github.com/WebAssembly/threads/issues/15
+}
+} // namespace atomic_queue
 #else
 #warning "Unknown CPU architecture. Using L1 cache line size of 64 bytes and no spinloop pause instruction."
 namespace atomic_queue {