diff --git a/programs/pkey/rsa_verify.c b/programs/pkey/rsa_verify.c
index cd29ef8..6dacdab 100644
--- a/programs/pkey/rsa_verify.c
+++ b/programs/pkey/rsa_verify.c
@@ -134,7 +134,7 @@
     if( ( ret = rsa_pkcs1_verify( &rsa, RSA_PUBLIC, SIG_RSA_SHA1,
                                   20, hash, buf ) ) != 0 )
     {
-        printf( " failed\n  ! rsa_pkcs1_verify returned %d\n\n", ret );
+        printf( " failed\n  ! rsa_pkcs1_verify returned -0x%0x\n\n", -ret );
         goto exit;
     }