diff --git a/libcxxabi/include/cxxabi.h b/libcxxabi/include/cxxabi.h
--- a/libcxxabi/include/cxxabi.h
+++ b/libcxxabi/include/cxxabi.h
@@ -138,7 +138,7 @@
 // 3.3.5.3 Runtime API
 extern _LIBCXXABI_FUNC_VIS int __cxa_atexit(void (*f)(void *), void *p,
                                             void *d);
-extern _LIBCXXABI_FUNC_VIS int __cxa_finalize(void *);
+extern _LIBCXXABI_FUNC_VIS void __cxa_finalize(void*);
 
 // 3.4 Demangler API
 extern _LIBCXXABI_FUNC_VIS char *__cxa_demangle(const char *mangled_name,