diff --git a/src/pki_mbedcrypto.c b/src/pki_mbedcrypto.c
index 08905cd9..ab09e2e9 100644
--- a/src/pki_mbedcrypto.c
+++ b/src/pki_mbedcrypto.c
@@ -246,7 +246,7 @@ int pki_privkey_build_rsa(ssh_key key,
                           ssh_string n,
                           ssh_string e,
                           ssh_string d,
-                          ssh_string iqmp,
+                          UNUSED_PARAM(ssh_string iqmp),
                           ssh_string p,
                           ssh_string q)
 {