diff --git a/lib/krb5/test_prf.c b/lib/krb5/test_prf.c
index 3ae80b496..e2199ed06 100644
--- a/lib/krb5/test_prf.c
+++ b/lib/krb5/test_prf.c
@@ -94,6 +94,8 @@ main(int argc, char **argv)
 
     krb5_crypto_destroy(context, crypto);
     
+    krb5_free_keyblock_contents(context, &key);
+
     krb5_free_context(context);
 
     return 0;