diff --git a/src/new.cpp b/src/new.cpp
index e3c4f886a..1f21f05da 100644
--- a/src/new.cpp
+++ b/src/new.cpp
@@ -32,3 +32,10 @@ void operator delete(void *p, std::size_t) noexcept
 }
 
 #endif
+
+#if defined(USE_JEMALLOC)
+extern "C" size_t malloc_usable_size(void *ptr)
+{
+    return zmalloc_usable(ptr);
+}
+#endif
\ No newline at end of file