diff --git a/crypto/pkcs12/p12_mutl.c b/crypto/pkcs12/p12_mutl.c
index d6b891920ce507d7156590ea8b0f1d5f273db72e..899a12e1345d156d08c14e3c0883613e717cbfd7 100644
--- a/crypto/pkcs12/p12_mutl.c
+++ b/crypto/pkcs12/p12_mutl.c
@@ -204,6 +204,9 @@ int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
 {
     X509_ALGOR *macalg;
 
+    PKCS12_MAC_DATA_free(p12->mac);
+    p12->mac = NULL;
+
     if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
         return PKCS12_ERROR;
     if (iter > 1) {