diff --git a/lib/krb5/keyblock.c b/lib/krb5/keyblock.c
index 3d0378735..a9d2fe924 100644
--- a/lib/krb5/keyblock.c
+++ b/lib/krb5/keyblock.c
@@ -35,6 +35,13 @@
 
 RCSID("$Id$");
 
+void
+krb5_keyblock_zero(krb5_keyblock *keyblock)
+{
+    keyblock->keytype = 0;
+    krb5_data_zero(&keyblock->keyvalue);
+}
+
 void
 krb5_free_keyblock_contents(krb5_context context,
 			    krb5_keyblock *keyblock)