diff --git a/wasm_patches/post.js b/wasm_patches/post.js
index 08138453..275a439f 100644
--- a/wasm_patches/post.js
+++ b/wasm_patches/post.js
@@ -4,6 +4,15 @@ Module.wasmTable = wasmTable;
 // Emscripten has a bug where it accidentally exposes an empty object as Module.ERRNO_CODES
 Module.ERRNO_CODES = ERRNO_CODES;
 
+// these are only defined for emscripten>=4.0.0
+if (typeof getCppExceptionTag !== 'undefined') {
+    Module['getCppExceptionTag'] = getCppExceptionTag;
+}
+
+if (typeof getExceptionMessage !== 'undefined') {
+    Module['getExceptionMessage'] = getExceptionMessage;
+}
+
 Module['async_init'] = async function(
     kernel_root_url,
     pkg_root_url,