diff --git a/cc.config.json b/cc.config.json
index add518b733d..f4d4da87658 100644
--- a/cc.config.json
+++ b/cc.config.json
@@ -663,6 +663,12 @@
             "value": false,
             "internal": true
         },
+        "WASM_FALLBACK": {
+            "comment": "An internal constant to indicate whether need a fallback of wasm.\nIf true, we build a wasm fallback module for the compatibility of wasm files compiled by different version of emscripten.\nThis is useful when we use wasm on different version of Safari browsers.",
+            "type": "boolean",
+            "value": "$HTML5",
+            "internal": true
+        },
         "WASM_SUBPACKAGE": {
             "comment": "An internal constant to indicate whether we use wasm assets as minigame subpackage.\nThis is useful when we need to reduce code size.",
             "type": "boolean",