diff --git a/include/openssl/crypto.h b/include/openssl/crypto.h
index fd05efb8..5c974f81 100644
--- a/include/openssl/crypto.h
+++ b/include/openssl/crypto.h
@@ -17,6 +17,10 @@
 
 #include <openssl/base.h>
 
+/* Upstream OpenSSL defines |OPENSSL_malloc|, etc., in crypto.h rather than
+ * mem.h. */
+#include <openssl/mem.h>
+
 
 #if defined(__cplusplus)
 extern "C" {