diff --git a/examples/io.c b/examples/io.c
index 5584c1102af43c315990aba33296f30e72d3219b..34d690825a7bec3432b16844be1849173132eb8b 100644
--- a/examples/io.c
+++ b/examples/io.c
@@ -175,7 +175,7 @@ read_rsa_key(const char *name,
   if (!length)
     return 0;
 
-  res = rsa_keypair_from_sexp(pub, priv, length, buffer);
+  res = rsa_keypair_from_sexp(pub, priv, 0, length, buffer);
   free(buffer);
 
   return res;