diff --git a/libcxxabi/src/cxa_thread_atexit.cpp b/libcxxabi/src/cxa_thread_atexit.cpp
index 402a52c741012..4435b19a02d20 100644
--- a/libcxxabi/src/cxa_thread_atexit.cpp
+++ b/libcxxabi/src/cxa_thread_atexit.cpp
@@ -106,7 +106,7 @@ namespace {
 
 #endif // HAVE___CXA_THREAD_ATEXIT_IMPL
 
-#if defined(__linux__) || defined(__Fuchsia__)
+#if defined(__linux__) || defined(__Fuchsia__) || defined(__wasm__)
 extern "C" {
 
   _LIBCXXABI_FUNC_VIS int __cxa_thread_atexit(Dtor dtor, void* obj, void* dso_symbol) throw() {
@@ -141,6 +141,6 @@ extern "C" {
     }
 #endif // HAVE___CXA_THREAD_ATEXIT_IMPL
   }
-} // extern "C"
-#endif // defined(__linux__) || defined(__Fuchsia__)
+#endif // defined(__linux__) || defined(__Fuchsia__) || defined(__wasm__)
+  } // extern "C"
 } // namespace __cxxabiv1