diff --git a/configure.ac b/configure.ac
index a366eff..3d68928 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,7 @@ CFLAGS="$CFLAGS -std=c99"
 
 # Crypto functions for MIFARE DesFire support are provided by OpenSSL.
 AC_CHECK_LIB([crypto], [DES_ecb_encrypt], [], [AC_MSG_ERROR([Cannot find libcrypto.])])
-AC_CHECK_HEADER([openssl/des.h], [], [AC_MSG_ERROR([Cannot find openssl headers.])])
+AC_CHECK_HEADERS([openssl/des.h openssl/rand.h], [], [AC_MSG_ERROR([Cannot find openssl headers.])])
 
 # Checks for pkg-config modules.
 LIBNFC_REQUIRED_VERSION="1.4.0"
diff --git a/libfreefare/mifare_desfire.c b/libfreefare/mifare_desfire.c
index 707daae..d683b46 100644
--- a/libfreefare/mifare_desfire.c
+++ b/libfreefare/mifare_desfire.c
@@ -62,6 +62,8 @@
 #  include <libutil.h>
 #endif
 
+#include <openssl/rand.h>
+
 #include <freefare.h>
 #include "freefare_internal.h"
 
@@ -351,7 +353,7 @@ mifare_desfire_authenticate (MifareTag tag, uint8_t key_no, MifareDESFireKey key
     mifare_cbc_des (key, MIFARE_DESFIRE (tag)->ivect,  PICC_RndB, 8, MD_RECEIVE, 0);
 
     uint8_t PCD_RndA[8];
-    DES_random_key ((DES_cblock*)&PCD_RndA);
+    RAND_bytes (PCD_RndA, 8);
 
     uint8_t PCD_r_RndB[8];
     memcpy (PCD_r_RndB, PICC_RndB, 8);