diff --git a/libc/malloc_debug/tests/log_fake.cpp b/libc/malloc_debug/tests/log_fake.cpp
index 194d42b..fb64e3e 100644
--- a/libc/malloc_debug/tests/log_fake.cpp
+++ b/libc/malloc_debug/tests/log_fake.cpp
@@ -44,7 +44,7 @@
   return g_fake_log_print;
 }
 
-extern "C" int __libc_format_log(int priority, const char* tag, const char* format, ...) {
+extern "C" int async_safe_format_log(int priority, const char* tag, const char* format, ...) {
   g_fake_log_print += std::to_string(priority) + ' ';
   g_fake_log_print += tag;
   g_fake_log_print += ' ';