diff --git a/libc/bionic/dlmalloc.h b/libc/bionic/dlmalloc.h
index e065687..482fe0e 100644
--- a/libc/bionic/dlmalloc.h
+++ b/libc/bionic/dlmalloc.h
@@ -32,10 +32,15 @@
 #define USE_SPIN_LOCKS 0
 #define DEFAULT_MMAP_THRESHOLD (64U * 1024U)
 
-/* Export two symbols used by the VM. */
 __BEGIN_DECLS
+
+/* Export two symbols used by the VM. */
 int dlmalloc_trim(size_t) __LIBC_ABI_PUBLIC__;
 void dlmalloc_inspect_all(void (*handler)(void*, void*, size_t, void*), void*) __LIBC_ABI_PUBLIC__;
+
+/* NVIDIA's libglcore.so has a reference to dlmalloc_usable_size. TODO: remove this. */
+size_t dlmalloc_usable_size(const void*) __LIBC_ABI_PUBLIC__;
+
 __END_DECLS
 
 /* Include the proper definitions. */