diff --git a/system/lib/libcxxabi/src/cxa_thread_atexit.cpp b/system/lib/libcxxabi/src/cxa_thread_atexit.cpp
index dcf283ceb1df..bd7677a10ef9 100644
--- a/system/lib/libcxxabi/src/cxa_thread_atexit.cpp
+++ b/system/lib/libcxxabi/src/cxa_thread_atexit.cpp
@@ -113,8 +113,8 @@ extern "C" {
     return __cxa_thread_atexit_impl(dtor, obj, dso_symbol);
 #else
 #ifndef __EMSCRIPTEN__
-    // Emscripten doesn't fully support weak undefined symbols yet
-    // https://github.com/emscripten-core/emscripten/issues/12819
+    // Emscripten doesn't implement __cxa_thread_atexit_impl, so we can simply
+    // avoid this check.
     if (__cxa_thread_atexit_impl) {
       return __cxa_thread_atexit_impl(dtor, obj, dso_symbol);
     } else