diff --git a/tests/features.json b/tests/features.json
index 3a203c48..9b8ad10d 100644
--- a/tests/features.json
+++ b/tests/features.json
@@ -12,7 +12,8 @@
       "--enable threads"
     ],
     "v8_flags": [
-      "--experimental-wasm-threads"
+      "--experimental-wasm-threads",
+      "--wasm_atomics_prototype"
     ]
   }
 }