diff --git a/src/dh-gex.c b/src/dh-gex.c
index 16ecd1be..6c75c69e 100644
--- a/src/dh-gex.c
+++ b/src/dh-gex.c
@@ -265,7 +265,7 @@ static SSH_PACKET_CALLBACK(ssh_packet_client_dhgex_reply)
     }
 
     rc = ssh_dh_import_next_pubkey_blob(session, pubkey_blob);
-    ssh_string_free(pubkey_blob);
+    SSH_STRING_FREE(pubkey_blob);
     if (rc != 0) {
         goto error;
     }