diff --git a/linker/linker_libcxx_support.cpp b/linker/linker_libcxx_support.cpp
index 41ed8bc..3d15b33 100644
--- a/linker/linker_libcxx_support.cpp
+++ b/linker/linker_libcxx_support.cpp
@@ -35,3 +35,7 @@
 extern "C" int __cxa_type_match() {
   async_safe_fatal("__cxa_type_match is not implemented in the linker");
 }
+
+int posix_memalign(void**, size_t, size_t) {
+  async_safe_fatal("posix_memalign is not implemented in the linker");
+}