--- a/js/src/builtin/TestingFunctions.cpp
+++ b/js/src/builtin/TestingFunctions.cpp
@@ -725,17 +725,18 @@ static bool WasmBulkMemSupported(JSConte
 #ifdef ENABLE_WASM_BULKMEM_OPS
   bool isSupported = true;
 #  ifdef ENABLE_WASM_CRANELIFT
   if (cx->options().wasmCranelift()) {
     isSupported = false;
   }
 #  endif
 #else
-  bool isSupported = false;
+  bool isSupported =
+      cx->realm()->creationOptions().getSharedMemoryAndAtomicsEnabled();
 #endif
   args.rval().setBoolean(isSupported);
   return true;
 }
 
 static bool WasmReftypesEnabled(JSContext* cx, unsigned argc, Value* vp) {
   CallArgs args = CallArgsFromVp(argc, vp);
   args.rval().setBoolean(wasm::HasReftypesSupport(cx));