diff --git a/include/openssl/mem.h b/include/openssl/mem.h
index ba48f07..31756f0 100644
--- a/include/openssl/mem.h
+++ b/include/openssl/mem.h
@@ -124,6 +124,13 @@
     OPENSSL_PRINTF_FORMAT_FUNC(3, 0);
 
 
+/* Deprecated functions. */
+
+#define CRYPTO_malloc OPENSSL_malloc
+#define CRYPTO_realloc OPENSSL_realloc
+#define CRYPTO_free OPENSSL_free
+
+
 #if defined(__cplusplus)
 }  /* extern C */
 #endif